Yorks Islands, also known as "Yorks 8 Islands" or "York's Islands" or simply "York Island(s)" are a group of several islands located in the flood plain of the Missouri River, in Broadwater County, Montana, about 4 miles south (up-river) from Townsend, Montana, along U.S. Highway 287. The islands were named by the Lewis and Clark Expedition (1803–1806) for Clark's servant/slave York, when the expedition passed this way in 1805 on their historic journey of exploration to the Pacific Ocean.