- a river rising in the SW Russian Federation near Belgorod, flowing SE through Ukraine to the Don River. About 650 miles (1045 km) long.
- Also called Donets Basin. an area S of this river, in E Ukraine: coal mining region and industrial area. 9650 sq. mi. (24,995 sq. km).
- another name for the Donbass
- a river rising in SW Russia, in the Kursk steppe and flowing southeast, through Ukraine, to the Don River. Length: about 1078 km (670 miles)