Mangazeya (Russian: Мангазе́я) was a Northwest Siberian trans-Ural trade colony and later city in the 17th century. Founded in 1600 by Cossacks from Tobolsk, it was situated on the Taz River, between the lower courses of the Ob and Yenisei Rivers flowing into the Arctic Ocean. The name derives from a Nenets ethnonym Monkansi or Mongandi.