The Yukon-Kuskokwim Delta is located in the western part of Alaska (USA) and is one of the world’s largest deltas, with a size of approximately 130,000 km². The delta mainly comprises tundra, wetlands, and mountainous areas. The false-colour image shows a frozen and snow-covered delta. The Yukon Wildlife Refuge, an area established for the conservation of among others various sea birds, Canada geese, salmon, and muskox, is located south of the delta.