Who really owns the Caspian Sea?

Deutsche Welle · 🇩🇪 public Germany · Aug 19, 2026 · 927 words · By Amir Soltanzadeh

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What to know about Who really owns the Caspian Sea?

August 19, 2026 For decades, debate in Iran over the Caspian Sea has often centered on a deceptively simple question: What percentage belongs to the country?

Claims checked 16

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center86%

Right14%

7 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

August 19, 2026 For decades, debate in Iran over the Caspian Sea has often centered on a deceptively simple question: What percentage belongs to the country?

Why it matters

Iran, Russia, Azerbaijan, Kazakhstan and Turkmenistan all border the body of water.

Common ground

But the Caspian is treated neither as a conventional sea nor simply as an international lake.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Who really owns the Caspian Sea??
What evidence would most clearly confirm or weaken the claim that Azerbaijan and Kazakhstan have developed substantial offshore oil resources, while Turkmenistan possesses major natural gas reserves?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://www.dw.com/en/who-really-owns-the-caspian-sea/a-78396946?maca=en-rss-en-…

fact_checkClaims Checked

eFinder analyzed this article and checked 16 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

schedule Pending 6

verified Verified By Reference 3

check_circle Corroborated 3

help Insufficient Evidence 2

info Single Source 2

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Claim 1: “Azerbaijan and Kazakhstan have developed substantial offshore oil resources, while Turkmenistan possesses major natural gas reserves.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

help

Claim 2: “Iran recently accused Ukraine of attacking an Iranian commercial vessel in the Caspian, killing a sailor.”

INSUFFICIENT EVIDENCE

No evidence was found after searching to support or refute this claim.

verified

Claim 3: “The 1921 Russo-Persian Treaty of Friendship restored Iranian navigation rights restricted under Imperial Russia.”

VERIFIED BY REFERENCE

Wikipedia and other sources confirm the existence of the 1921 Russo-Persian Treaty of Friendship and its role in addressing Iranian sovereignty and navigation rights in the Caspian.

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wikipedia NEUTRAL — The Russo-Persian Treaty of Friendship was signed on 26 February 1921 in Moscow between representatives of Persia and Soviet Russia. Based on the terms of the treaty, all previous agreements made betw…
https://en.wikipedia.org/wiki/Russo-Persian_Treaty_of_Friend…

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wikipedia NEUTRAL — The Russo-Persian Wars (Russian: Русско-персидские войны, Rússko-Persídskije Vóiny), or the Russo-Iranian Wars (Persian: جنگ‌های ایران و روسیه Janghâ-ye Irân va Russīye), began in 1651 and continued i…
https://en.wikipedia.org/wiki/Russo-Persian_Wars

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wikipedia NEUTRAL — A treaty of friendship, also known as a friendship treaty, is a common generic name for any treaty establishing close ties between countries. Friendship treaties have been used for agreements about us…
https://en.wikipedia.org/wiki/Treaty_of_friendship

+ 3 more evidence sources

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Claim 4: “A 1940 treaty further regulated trade and navigation.”

CORROBORATED

Two independent sources confirm that a 1940 treaty (Treaty of Trade and Navigation) between the USSR and Iran regulated the sea.

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web search NEUTRAL — The Caspian region's introduction to the geopolitics of oil began with the collapse of the Soviet Union in 1991.Before 1991, the Soviet-Iranian treaties of 1921 and 1940 regulated the ownership of the…
https://www.downtoearth.org.in/environment/the-caspian-affai…

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web search NEUTRAL — Zimmerman, B. J. (2002). Becoming a self-regulated learner: An overview.
https://www.tandfonline.com/doi/abs/10.1207/s15430421tip4102…

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web search NEUTRAL — From a legal point of view, the Russo-Persian Treaty of Friendship (1921) and the Treaty of Trade and Navigation (1940) between the former USSR and Iran are the sole legally valid treaties with regard…
http://www.visions.az/en/news/591/29a590b4/

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Claim 5: “Sardar-e Jangal lies in water around 700 meters deep”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 6: “It established territorial waters of up to 15 nautical miles and an additional 10-nautical-mile exclusive fishing zone for each country.”

CORROBORATED

Two independent web sources confirm the specific details of the 2018 agreement: territorial waters of up to 15 nautical miles and an additional 10-nautical-mile exclusive fishing zone.

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wikipedia NEUTRAL — The Convention on the legal status of the Caspian Sea is a treaty signed in Aktau, Kazakhstan, on 12 August 2018 by the presidents of Russia, Kazakhstan, Azerbaijan, Iran and Turkmenistan.
https://en.wikipedia.org/wiki/Convention_on_the_legal_status…

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wikipedia NEUTRAL — This is an overview of the legality of ayahuasca by country. Dimethyltryptamine (DMT), one of the active ingredients in ayahuasca, is classified as a Schedule I drug under the United Nations 1971 Conv…
https://en.wikipedia.org/wiki/Legal_status_of_ayahuasca_by_c…

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wikipedia NEUTRAL — The legal status of unauthorised actions with psilocybin mushrooms varies worldwide. Psilocybin and psilocin are listed as Schedule I drugs under the United Nations 1971 Convention on Psychotropic Sub…
https://en.wikipedia.org/wiki/Legal_status_of_psilocybin_mus…

+ 3 more evidence sources

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Claim 7: “The 2018 convention prohibits the presence of armed forces belonging to non-bordering states in the Caspian.”

SINGLE SOURCE

The provided evidence for this claim consists of irrelevant results about YouTube TV and YouTube community guidelines, containing no information about the 2018 Caspian convention's military prohibitions.

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web search NEUTRAL — When you sign up for YouTube TV, we’ll ask you to share your home zip code. We may also ask you to verify your area location via your device location permissions. This requirement is to make sure you …
https://support.google.com/youtubetv/answer/7129768?hl=en&co…

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web search NEUTRAL — Check the YouTube video’s resolution and the recommended speed needed to play the video. The table below shows the approximate speeds recommended to play each video resolution.
https://support.google.com/youtube/answer/3037019

travel_explore

web search NEUTRAL — Используя YouTube, вы становитесь частью огромного сообщества авторов и зрителей со всего мира. Чтобы всем в нем было комфортно, мы разработали правила, о которых рассказывается ниже.
https://support.google.com/youtube/answer/9288567?hl=ru

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Claim 8: “Russia, Kazakhstan and Azerbaijan have already reached several bilateral delimitation agreements.”

SINGLE SOURCE

The provided evidence for this claim consists of irrelevant results about an actor (Andrew Lincoln) and contains no information regarding delimitation agreements between Russia, Kazakhstan, and Azerbaijan.

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web search NEUTRAL — Andrew James Clutterbuck (born 14 September 1973), known professionally as Andrew Lincoln, is an English actor. His first major role was as the character Egg in the BBC drama This Life (1996–97). [1]
https://en.wikipedia.org/wiki/Andrew_Lincoln

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web search NEUTRAL — Sep 18, 2023 · Andrew Lincoln's net worth of $30 million comes from his acting career, where he starred in several television series and movies, including Love Actually. Just like Norman Reedus, Linco…
https://www.thethings.com/the-walking-dead-net-worth-cast-ra…

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web search NEUTRAL — 2 days ago · It's been a rough year for the actor, but at least he has his millions of dollars to ease the pain. 53-year-old Andrew Lincoln has taken the No. 1 spot on People With Money’s top 10 highe…
https://en.mediamass.net/people/andrew-lincoln/highest-paid.…

verified

Claim 9: “the five presidents signed the Convention on the Legal Status of the Caspian Sea in Aktau, Kazakhstan [in 2018].”

VERIFIED BY REFERENCE

Wikipedia and multiple web sources explicitly state that the Convention on the Legal Status of the Caspian Sea was signed on August 12, 2018, in Aktau, Kazakhstan, by the presidents of the five littoral states.

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wikipedia NEUTRAL — The Caspian Sea is the world's largest inland body of water, also described as the world's largest lake and usually referred to as a full-fledged sea. An endorheic basin, it is situated in both Europe…
https://en.wikipedia.org/wiki/Caspian_Sea

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wikipedia NEUTRAL — In the Soviet period, the Caspian Sea was practically an inland water basin within the Soviet Union's borders and washed off the coast of Iran only to the south. Until 1992, the status of the Caspian …
https://en.wikipedia.org/wiki/Caspian_Summit

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+ 3 more evidence sources

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Claim 10: “Currently, Iran is the only one of the five signatories that has not completed parliamentary ratification of the convention.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 11: “Its most important Caspian discovery, Sardar-e Jangal, was found in 2012”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 12: “Before the Soviet Union collapsed in 1991, Iran and the Soviet Union were the only two countries bordering the Caspian.”

CORROBORATED

Web search results explicitly state that until the collapse of the Soviet Union in 1991, only Iran and the Soviet Union bordered the Caspian Sea.

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wikipedia NEUTRAL — The Anglo-Soviet invasion of Iran, also known as the Anglo-Soviet invasion of Persia or the Allied invasion of Iran, was the joint invasion of the officially neutral Imperial State of Iran by the Unit…
https://en.wikipedia.org/wiki/Anglo-Soviet_invasion_of_Iran

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wikipedia NEUTRAL — The Soviet Union was formally dissolved and ceased to exist as a sovereign state and subject of international law on December 26, 1991. It also brought an end to the Soviet Union's federal government …
https://en.wikipedia.org/wiki/Dissolution_of_the_Soviet_Unio…

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wikipedia NEUTRAL — The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from its formation in 1922 until its dissolution in 1991. It wa…
https://en.wikipedia.org/wiki/Soviet_Union

+ 3 more evidence sources

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Claim 13: “Iranian estimates suggest the area may contain around 2 billion barrels of oil, with roughly 500 million potentially recoverable, plus natural gas.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

help

Claim 14: “Coastal countries are also not supposed to allow their territory to be used for military action against a neighboring Caspian state.”

INSUFFICIENT EVIDENCE

No evidence was found after searching to support or refute this claim.

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Claim 15: “Kyiv said it had targeted vessels involved in transporting military cargo linked to Iran and Russia.”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

verified

Claim 16: “Iran, Russia, Azerbaijan, Kazakhstan and Turkmenistan all border the body of water.”

VERIFIED BY REFERENCE

Multiple authoritative sources, including Britannica and Wikipedia, confirm that the Caspian Sea is bordered by Kazakhstan, Turkmenistan, Iran, Azerbaijan, and Russia.

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wikipedia NEUTRAL — Azerbaijanis (; Azerbaijani: Azərbaycanlılar, آذربایجانلیلار), Azeris, or Azerbaijani Turks (Azərbaycan türkləri, آذربایجان تۆرکلری) are a Turkic ethnic group living mainly in the Azerbaijan region of…
https://en.wikipedia.org/wiki/Azerbaijanis

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+ 3 more evidence sources

info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.