Tendoy, Idaho is a small community located in Lemhi County, in the eastern part of the state. It is nestled in a picturesque valley surrounded by beautiful mountains and vast prairies. The climate in Tendoy is generally characterized as semi-arid, with hot summers and cold winters. Average temperatures range from the low 20s°F (-6°C) in winter to the high 80s°F (30°C) in summer.

The hydrology of Tendoy is influenced by the Lemhi River, which flows nearby. The river provides a vital water source for the community and supports various aquatic species. Fishing enthusiasts can enjoy catching trout, steelhead, and Chinook salmon in the Lemhi River.

Tendoy offers a multitude of outdoor recreation opportunities. The nearby Salmon-Challis National Forest provides extensive trails for hiking, biking, and horseback riding. Hunting is popular in the area, with opportunities for big game hunting such as elk, deer, and moose. The Lemhi Valley also offers excellent birdwatching, as it is a stopover for various migratory birds. Additionally, the area is known for its stunning natural beauty, making it an ideal destination for camping, photography, and wildlife viewing.