The Yukon–Kuskokwim Delta is a river delta located where the Yukon and Kuskokwim rivers empty into the Bering Sea on the west coast of the U.S. state of Alaska. At approximately 129,500 square kilometers in size, it is one of the largest deltas in the world. It is larger than the Mississippi River Delta ; it is comparable in size to the entire U.S. state of Louisiana. T…The Yukon–Kuskokwim Delta is a river delta located where the Yukon and Kuskokwim rivers empty into the Bering Sea on the west coast of the U.S. state of Alaska. At approximately 129,500 square kilometers in size, it is one of the largest deltas in the world. It is larger than the Mississippi River Delta ; it is comparable in size to the entire U.S. state of Louisiana. The delta, which consists mainly of tundra, is protected as part of the Yukon Delta National Wildlife Refuge.