De Tvertsa wordt gevoed door (links) de Osetsjenka, Kleine Tigma, Grote Tigma, Logovezj, Kava, (rechts) de Sjegra en de Osoega. ###>The principal tributaries of the Tvertsa are the Tigma River (left), the Shchegrinka River (right), the Osuga River (right), the Logovyazh River (left), and the Kava River (left).