The Trona industry is the major employer in Wyoming's Sweetwater County. There are five producers operating in the County producing over 15 million tons of Trona and over 8 million tons of soda ash each year. The city of Green River takes its name from the Green River which flows through the center of the city. The river flows through a broad steep-sided valley with prominent rock formations along either side. Expedition Island, the Green Belt Nature Area, and Scotts Bottom Nature Area are found along the river.
Expedition Island is found immediately southwest fo the railroad yards.
The island was the point where John Wesley Powell began his expedition down the Green and Colorado Rivers which culminated in his trip through the Grand Canyon. Downstream from Expedition Island on the south bank of the river is the Green Belt Nature Area. This area contains nature paths which run along the edge of the river. Water fowl and other types of birds nest in the tall grass and bushes which grown throughouut the area. Further to the south at the southern edge of the river is the Scotts Bottom Nature Area.