The vivid blue half circle (bottom) in this Landsat 5 image from 2005 is Russia’s Chaunskaya Bay in northeastern Siberia. Two major rivers, the Chaun and Palyavaam, flow into the bay, which in turn opens into the Arctic Ocean. Ribbon lakes and bogs are present throughout the area, created by depressions left by receding glaciers. Owing to its extreme northern location, the bay is covered by ice most of the year.