Dubysa, at 131 km, is the 15th longest river solely in Lithuania. It originates just a few kilometers from Lake Rėkyva near Šiauliai city. At first it flows south, but at Lyduvėnai turns southeast and near Ariogala - southwest. Dubysa is a Samogitian river. The first few kilometres of Dybysa are also known as Genupis or Šventupis.Dubysa has about 40 tributaries, the largest being Kražantė on the right and Šiaušė, Gryžuva, and Gynėvė on the left.