▲The island is noted for its populous seal rookies that harbor, among other species, the northern fur seal (pictured).

▲The small island of Buldir has recorded 21 breeding seabird species, including the gregarious red-legged kittiwake (pictured).

▲The eruption of the Cleveland Volcano on Chuginadak Island, part of the Islands of Four Mountains chain, took place in 2009.

▲The Islands of Four Mountains is an island chain of the Aleutian Islands. The four volcanoes provide one of the most visually dramatic canvases in the region.

▲The Aleuts are the indigenous people of the Aleutian Islands. Their name is derived from the Aleut word "allithuh," meaning "coastal people." Pictured is a group of Aleut hunters from Bering Island in the late 19th century.

▲During WWII, Japanese forces occupied Attu and Kiska in the Near Islands chain.

▲In this image, a solidified volcano ash flow deposit lends an unusual perspective to this stretch of coastline. Davidof Island is part of the Rat Islands chain.

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This detail from an early map by first Kamchatka expedition member S. Khitrov shows eastern Kamchatka, including the Commander Islands, with drawings of Steller's sea cow, the northern fur seal, and the Steller sea lion. The expedition was led by Vitus Bering.

▲This is the largest and westernmost island of the Aleutian's Commander Islands chain. It's described as the "hidden jewel of the US-Russia Maritime Boundary." Its capital, Nikolskoye, has a population of just 676.

▲Unimak Island is the largest island in the Aleutian Islands chain. The Unimak Pass (pictured) is notorious for its powerful and dangerous rip tides.

▲Pictured is the Pavlof Volcano, located on the Alaska Peninsula, spewing ash across the Aleutian Islands during a 2016 eruption.

▲In what became known as the Aleutian Islands Campaign, US troops engaged the Japanese Army at the Battle of Attu. The Americans also landed on Kiska Island. Both sides suffered heavy casualties before the islands were retaken.

▲The ice blue waters of Kagamil Island and the weird basalt columns off its coast make this island particularly alluring. Kagamil is part of the Islands of Four Mountains chain.

▲Collectively named for the brown rats accidentally introduced to the islands in about 1780, the island chain is now free of the rodents.

▲Pictured is one of only two remaining known B-24 wrecks on Atka Island. The bomber crash landed in December 1942, during the Aleutian Islands Campaign, with no loss of life.

▲The wonderfully named Valley of Ten Thousand Smokes is located in Katmai National Park and Preserve, on the Alaska Peninsula. If you plan to visit the Aleutian Islands, the peninsula serves as an ideal starting point.

▲Pictured is the Holy Trinity Orthodox Cathedral in Petropavlovsk-Kamchatsky. The Russian Aleutians are administered under the auspices of Kamchatka Krai in the Russian Federation.

▲Part of the Andreanof Islands chain, Tanaga features volcanoes, waterfalls, a scattering of Aleut villages, but no native wildlife.

▲Dramatic volcano scenery characterizes the Aleutian Range of mountains in Southwest Alaska. The American Aleutians belong to the US state of Alaska.

▲The remote and spectacular Kronotsky Nature Reserve, located on the coast of the Kamchatka Peninsula, is one of the stopping off points before the Russian Aleutians. Tourists can only visit for one day, and access is by helicopter.

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About 1% of the global population of tuffted puffins live on Agattu Island, part of the Near Islands chain.

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One of the islands in Russia's Commander Islands chain, Medny is home to an abundant population of Steller sea lions.

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A settlement once thrived on Medny, but in 1970 all inhabitants were transferred to Bering Island. Save for a few visiting scientists, Medney today is completely unoccupied.

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The Aleutian Islands belong to Alaska and Kamchatka Krai, part of the Russian Federation.

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The area around Bering Island is a biosphere reserve. The region is known for its diverse wildlife, especially marine mammals.

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The Bering Sea is named after Danish cartographer and explorer Vitus Bering, who charted the region in Russian service. He is buried on Bering Island.

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A glaucous-winged gull chick enters the world somewhere on the Semechi Islands chain.

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The Steller sea lion is a noisy and territorial summer visitor. The species is named after German naturalist Georg Wilhelm Steller, who first described them in 1741.

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Set in the Northern Pacific Ocean, the Aleutian Islands—"Land of the Aleuts"—form an archipelago of 14 large volcanic islands and 55 smaller ones belonging to The USA and Russia. Wild and remote, these barren volcanic islands appear as stepping stones, a broken causeway that might have once linked Asia to America.

Browse the gallery and island-hop these isolated outposts shared by two superpowers.