The highest central-eastern part of the oblast is the Azov Upland. It extends to the east and to the territory of Donetsk Oblast, where it meets the Donetsk ridge. In the south, between the Azov Upland and the Sea of Azov, is the western part of the Azov coastal plain, which flows into the Black Sea west of the Molochna River. The north-eastern end of the coastal plain merges with the Zaporizhzhia inner plain, which borders on the south-eastern outskirts of the Dnieper Upland. Thus, the territory of Zaporizhia Oblast consists of two distinct geomorphological parts: the outskirts of the Azov and Dnipro uplands, which structurally correspond to the southeastern part of the Ukrainian crystalline massif and the outskirts of the coastal Priazov and Black Sea plains, which are located within the Black Sea basin.