The Aleutian Island change separates the North Pacific Ocean (Gulf of Alaska) from the Bering Sea. There are many active volcanoes on this chain, which is part of the tectonically active "Ring of Fire" that also gave birth to the Hawaiian Islands.
A view of Shishaldin volcano as we pass by on our way into the Bering Sea. (Photo by A. Balsom)
Above: A fog-enveloped Akun Head. There were hundreds of thousands of sea birds visible all around the Aleutian Islands. (Photo by A. Balsom)