Lyginus
The Rositsa (Bulgarian: Росица) is a river in central northern Bulgaria, the most important tributary (a left one) of the Yantra River. It is 164 kilometres (102 mi) long and has a drainage basin of 2,265 square kilometres (875 sq mi). Its ancient name was Lyginus.
The river has its source in the Central Balkan Mountains between Shipka Pass to the east and Botev Peak to the west and flows north until Sevlievo, after which it gradually turns east-northeast until emptying into the Yantra. There is a dam on the river some 10–15 kilometres (6–9 mi) after Sevlievo, Aleksandar Stamboliyski Dam.
An important tributary is the Vidima, which flows into the Rositsa at Sevlievo. Other tributaries include the Negoychevitsa, the Kravenishka, the Byala and the Bagareshtitsa from the left, as well as the Malobuhalshtitsa, the Zelenikovets and the Marishtnitsa from the right.
Coordinates: 43°15′N 25°42′E / 43.250°N 25.700°E
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