The Jackson region is located in the far west of Wyoming, with the Idaho border on the west boundary, Yellowstone National Park forms the north boundary and the east boundary follows the Continental Divide south to the divide of the Wyoming Range to Salt Pass. The Snake River is the major waterway with its many tributaries including the Buffalo Fork, Gros Ventre, Hoback, Grey's and Salt rivers. The major lakes include Jackson, Jenny, Bradley, Taggart, and Phelps in the Tetons; Slide Lake in the Gros Ventre and Palisades Reservoir on the Idaho Border. Major towns include Jackson, Afton, Thayne, Alpine, Wilson and Bondurant. The Jackson Region also includes Grand Teton National Park and the National Elk Refuge.