Lake Sakakawea, with more than 1600 miles (2576 kilometers) of shoreline, is featured in this south-southwest-looking, low-oblique photograph. The lake extends westward almost 200 miles (322 kilometers) to near Williston, North Dakota (not in photograph). A smaller portion of the lake, including the Van Hook Arm, lies within the Fort Berthold Indian Reservation. The part of the Missouri River that forms Lake Sakakawea marks the approximate boundary of glaciers that covered North Dakota—to the east and north glacial deposits blanket the land, and to the west and south lie bedrock and the Bad Lands through which travels the Little Missouri River before entering Lake Sakakawea. Garrison Dam (left center) is one of the largest rolled-earth dams in the world. To its east appear Audubon Lake and the Audubon National Wildlife Refuge.