-- 403 km (250 mi)
*Kosva River -- 283 km (176 mi)
*Kosa River -- 267 km (165 mi)
*Veslyana River -- 266 km (165 mi)
*Inva River -- 257 km (159 mi)
*Obva River -- 247 km (153 mi)

There are also many small rivers, but some of them have historical significance, for example