The Terek Cossack Host was a Cossack host created in 1577 from free Cossacks who resettled from the Volga to the Terek River. The local aboriginal Terek Cossacks joined this Cossack host later. In 1792 it was included in the Caucasus Line Cossack Host and separated from it again in 1860, with the capital of Vladikavkaz. In 1916 the population of the Host was 255,000 within an area of 1.9 million desyatinas.

The Terek is a major river in the Northern Caucasus. It originates in the Mtskheta-Mtianeti region of Georgia and flows through North Caucasus region of Russia into the Caspian Sea. It rises near the juncture of the Greater Caucasus Mountain Range and the Khokh Range, to the southwest of Mount Kazbek, winding north in a white torrent between the town of Stepantsminda and the village of Gergeti toward the Russian region North Ossetia and the city of Vladikavkaz. It turns east to flow through Chechnya and Dagestan before dividing into two branches which empty into the Caspian Sea. Below the city of Kizlyar it forms a swampy river delta around 100 kilometres (62 mi) wide. The river is a key natural asset in the region, providing irrigation and hydroelectric power in its upper reaches.