Bonneville county is in southeast Idaho, part of the Upper Snake River Valley. Its eastern border is also the state border between Idaho and Wyoming. Idaho Falls, originally called Eagle Rock, is the county seat. Other communities are Ammon, Beachs Corner, Bone, Coltman, Cotton, Dehlin, Gerrard, Gray, Hackman, Indian, Iona, Irwin, Lincoln, Milo, New Sweden, Orvin, Osgood, Ozone, Palisades, Payne, Poplar, Swan Valley, Taylorville, and Ucon. More than half the county is in the Targhee and Caribou National Forests. It includes the Gray's Lake National Wildlife Refuge. Major industries include farming and the Idaho National Engineering Laboratory under the direction of The U.S. Department of Energy. It covers 1,897 square miles.