The Ik (, Iq;, Iq) is a river in Russia that flows north to the Kama, joining it from the left. It flows through the Republics of Bashkortostan and Tatarstan and through Orenburg Oblast. The left tributaries of the Ik are Mellya, Menzelya, Dymka, and the right tributary is Usen. It is 571 km long, and its drainage basin covers 18100 km2. The time difference between Bavly in Tatarstan and Oktyabrsky in Bashkortostan is two hours (Tatarstan uses Moscow Time and Bashkortostan uses Yekaterinburg Time). Therefore, the bridge through Ik (river-border) is jokingly called "the longest bridge in the world".