To be the basis of popular elections, the National Convention of the 2 January 1857 created the District of Mancos as part of the Province of Santa.

It is located in the central part of the Callejon de Huaylas, in the right margin of the Rio Santa, snow at the foot of the colossus that is Mount Huascaran dominant eastern side and whose melting born Mancos River crossing from east to west to flow into the Rio Santa.

Bordered on the north, with Ranrahica district, separated by the stream of Putucauchachin and a road that lows from the village of Cochapampa, on the south by the province of Carhuaz, by means of an imaginary line which is a milestone in a place called Malpaso, on the east the village of Cochapampa and Tumpa belonging to the jurisdiction of Ranrahirca and Yungay respectively, and the stream of Ulta which separates it from Yanama, and on the west the districts of Shupluy and Cascapara on the left bank of the river Santa.

Due to its location and orography Mancos enjoys a delicious and excellent climate that provides healthy living to its inhabitants and start to the variety of its agricultural products.

But it is particularly characterised by having a mild and dry weather in the time when the river grows and becoming something relatively hot and a bit humid, in the rainy season, felt in the SE.