- Lander, Wyoming, nestled against the foothills of the Wind River Mountains, just south of Grand Teton and Yellowstone National Park. On the banks of the Popo Agie River, Lander is where history began in Fremont County. Lander saw the first white trappers in 1811, became a small military post in 1869 and now borders the Wind River Indian Reservation.landerchamber.org