South Dakota is located in the Great Plains region of the US. Montana and Wyoming form the western border. North Dakota is to the north. Minnesota and Iowa are to the east and Nebraska is to the south. Retail, finance, and health care make up the main economic outputs for South Dakota. Rapid City, South Dakota is home to Ellsworth Air Force Base, the second largest employer in the state. However, agriculture is still a very important face in South Dakota's economy. Tourists flock to the state to see the Black Hills, Mount Rushmore, Deadwood and the Sturgis Motorcycle Rally.