The Podolian Upland and the Volhynian Upland are sometimes grouped together as the Volhynian-Podolian Upland. It should be known that both uplands are separated by a plain called "Little Polesia" (Ukrainian: ? ?).
Volhynian Upland lays between Western Bug and Korchyk River which is a tributary of Sluch River. It stretches for over 200 km (120 mi) with a width around 80 km (50 mi). Average elevation is 220-250 m (720-820 ft) with the maximum being Mizoch Ridge 342 m (1,122 ft). Its surface is weakly wavy dissected by wide river valleys and gulches.
Geologically, it consists of Paleozoic deposits overlapped with rocks of Cretaceous system. There are karst forms of relief and in karstic depressions there exist small lakes. Among minerals there are chalk, black coal, peat, pegmatites, clays. Widespread there are peat bogs.
The geographic region consists of following distinct smaller sub-regions