These large plains on Venus that consist of extensive, probably basaltic, lava flows and could be compared to the Earth's ocean basins in respect to extent and composition. Features seen within the lowlands include broad bowl-like depressions, flood lavas (similar to the Columbia River Basalts on Earth), lava channels that can extend for hundreds of kilometers, and compressional ridges. The largest lowland feature is Atalanta Planitia, which is located east of Ishtar Terra (~165° E Long., 65° N Lat.) and is about the size of the Gulf of Mexico.