The Diomede Islands
Two islands in the Bering Strait about 4 km apart, one Russian and one American. The border between them is also the International Date Line, so Big Diomede is a day ahead of Little Diomede. The Cold War split the families who lived on both.
Written from cited sourcesLast checked 28 September 2026Suggest a correction
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Russia →
United States →
Two islands, two countries
The Diomede Islands sit in the middle of the Bering Strait, about 2.5 miles (4 km) apart. The larger, Big Diomede or Ratmanov Island, covers about 10 km² and belongs to Russia’s Chukotka district. Little Diomede, to the east, is part of Alaska. The first European to see them was the Danish navigator Vitus Bering, on St. Diomede’s Day, 16 August 1728.[1]
The line between them dates from 1867, when Russia sold Alaska to the United States. The treaty ran the western limit of Alaska through the Bering Strait along the meridian midway between the island of Krusenstern, or Ignalook, and the island of Ratmanoff, or Noonarbook, the Russian name for Big Diomede.[2][1]
“the meridian which passes midway between the islands of Krusenstern, or Ignalook, and the island of Ratmanoff, or Noonarbook”[2]
Tomorrow and yesterday
The US–Russian boundary between the islands coincides with the International Date Line.[1] So although you can see one island from the other, Big Diomede, on the Asian side of the line, is a calendar day ahead of Little Diomede.[1]
The Ice Curtain
For hundreds of years Indigenous people travelled freely between the two islands. That ended with the Cold War. In 1948, when the political “ice curtain” came down, Soviet authorities ordered the 25 to 30 remaining people on Big Diomede to move to the Yup’ik village of Naukan in Chukotka. Naukan was closed a decade later and they were scattered again.[3]
Big Diomede has no permanent population today; it hosts a Russian weather station and a border guard post.[1][3] Across the strait, Little Diomede residents such as Robert Soolook, an Inupiaq, can see the island where their relatives once lived. In 2015 the village was working with National Park Service grants to reconnect with families on the Russian side.[3]
A swim across the line
On 7 August 1987, as the Cold War thawed, the American swimmer Lynne Cox swam from Little Diomede to Big Diomede in water just above freezing, wearing only a swimsuit. She was in the water for 2 hours and 16 minutes and crossed the date line on the way: the first recorded swim from the United States to the Soviet Union.[4]
At the White House signing of the INF treaty, Mikhail Gorbachev mentioned her swim, saying it had taken one brave American just two hours to swim from one of their countries to the other.[4]
Timeline
172816 August 1728
Bering
Vitus Bering sights the islands on St. Diomede’s Day.[1]
1867
Alaska treaty
The new US–Russian line is drawn midway between the islands.[2]
1948
Ice curtain
Soviet authorities move Big Diomede’s last residents to the mainland.[3]
19877 August 1987
Lynne Cox
An American swims from Little to Big Diomede.[4]
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Sources
- [1]Diomede Islands · Encyclopaedia Britannica
- [2]Treaty with Russia for the Purchase of Alaska (1867) · The Avalon Project, Yale Law School · 30 March 1867
- [3]Alaskan Inupiat village seeks reunion with relatives from Russian island · The Associated Press (via CBC News) · 18 August 2015
- [4]Lynne Cox swims into communist territory · HISTORY.com
- [5]Admin 0 countries, 1:10m (world-atlas) · Natural Earth
Map geometry from Natural Earth via world-atlas. See credits.