Rimava is a river in southern central Slovakia, which flows only in the Rimavská Sobota District. It is the right tributary of the Slaná river.
It is 88km long, its source is in Veporské vrchy at approximately 1 130 m above sea level. It flows through these towns:Tisovec, Hnúšťa and Rimavská Sobota. It pours to the Slaná river near Vlkyňa at 145 m a.s.l.