The correct answer is - It was in a mountainous region.
The Inca Empire, unlike most of the other advanced civilizations, was not located alongside large rivers and in lowland areas. This empire was located in a mountainous region, more specifically in the Andes Mountain Range. Almost of the territory that the Inca Empire had was on high elevation, with only little areas where the boundaries of the empire were going to the highlands or lowlands. This empire was located in the western part of the South American continent, on the territories of what are now Bolivia, Peru, Ecuador, and little areas of Argentina, Chile and Colombia.