The Kilmez (Russian: Кильмезь; Udmurt: Калмез) is a river in Udmurtia and Kirov Oblast in Russia, a left tributary of the Vyatka. The river is 270 kilometres (170 mi) long, and the area of its drainage basin is 17,200 square kilometres (6,600 sq mi).^[1] The Kilmez freezes over in November and remains icebound until the second half of April. Its main tributaries are the Lumpun, Loban, and Vala.