San Sebastian is a municipality located in the Cauca Department of southwestern Colombia. It is situated in the mountainous Andean region of the country, which characterizes much of the geography of Cauca.
Like many municipalities in Cauca Department, San Sebastian has a predominantly rural character typical of Colombia's interior highland zones. The department itself is known for its diverse indigenous and Afro-Colombian populations and its agricultural economy, though specific details about San Sebastian's local economy, demographics, or principal activities are not well documented in readily available sources.