The geographical term that refers to a large, flat area of high land is a plateau. Plateaus are typically characterized by their elevated terrain and relatively flat surfaces, often resulting from volcanic activity, erosion, or uplift of land. They can be found in various regions worldwide, contributing to unique ecosystems and important natural resources. Plateaus play a significant role in local climates and landscapes, often serving as suitable areas for agriculture and habitation due to their well-drained soils and sufficient sunlight.