The Whetstone River is a tributary of the Missouri River located in the state of South Dakota. It flows through the scenic landscapes of the region, providing a habitat for various wildlife and supporting local ecosystems. The river is approximately 50 miles long and is known for its clear waters and recreational opportunities. The Whetstone River is popular for activities such as fishing, kayaking, and canoeing. Its banks are lined with trees and vegetation, making it a picturesque spot for nature enthusiasts. The river also plays a role in local agriculture by providing irrigation for nearby farms.