The Tumuc-Humac Mountains are a mountain range located in the northeastern part of South America, primarily in the country of French Guiana. This range extends into parts of Brazil and Suriname. The mountains are known for their rich biodiversity and unique ecosystems, which include tropical rainforests and various endemic species. The Tumuc-Humac Mountains are part of the larger Guiana Shield, a geological formation that is one of the oldest in the world. The region is relatively remote and less explored, making it an area of interest for researchers studying geology, ecology, and conservation efforts.