Earth from Space | Smithsonian Institution | Lena River Delta
Just a quick note - this is cool as hell. Clicking the above link allows you to zoom in with great detail to the image of the Lena River Delta (as well as other natural and man-made features).
The Lena River flows north for more than 2,800 miles (4,500 kilometers) through Russian Siberia to the Arctic Ocean. As the river enters the Laptev Sea, it divides into many channels to form a biologically rich delta. Such images help determine the extent of wetland vegetation.