The Taz Estuary (Russian: Тазовская губа) is a long gulf formed by the Taz River. It consists of a roughly 250-kilometer (160 mi) long estuary that begins in the area of the settlement of Tazovsky and ends in the Gulf of Ob, which is connected with the Kara Sea. Its average width is about 25 kilometers (16 mi) and it is one of the biggest estuaries in the world.