An oceanic plateau is a large, relatively flat region of the ocean floor that is elevated above the surrounding seafloor, often formed by large-scale volcanic activity. These plateaus are significant for understanding the processes of mantle plumes, hotspot volcanism, and the formation of large igneous provinces.
Source Coffin, M. F., & Eldholm, O. (1994). “Large Igneous Provinces: Crustal Structure, Dimensions, and External Consequences.” Reviews of Geophysics, 32(1), 1-36.