1. Yukon Delta aerial-Vyn-100909-0138.jpg
The Yukon and Kuskokwim rivers combine to form one of the largest delta systems in the world. Completely free flowing, only the Mississippi in North America is comparable. it contains 70-80% of all coastal wetland habitat in Alaska and is unequalled in its importance to migratory and nesting waterfowl and shorebirds. Yukon Delta National Wildlfie Refuge, Alaska. September.