Mountain Province is bounded in the east by Isabela, in the north by the provinces of Kalinga, Apayao, and Abra, in the south of Benguet and Ifugao, and in the west by the province of Ilocos Sur. It has an area of 229,231 hectares with 83% mountainous while 17% make up hills and levels. The province has many rivers, waterfalls, mountains, and caves.
Mountain Province is sometimes incorrectly named Mountain in some foreign references. The name is also incorrectly shortened by locals to Mt. Province, which in turn is read by native Anglophones as "Mount Province". The province was named so for being in the Cordillera Central mountain range found in the upper realms of Luzon island.
Mountain Province was also the name of the historical province that included most of the current Cordillera provinces. This old province was established by the Americans in 1908 and was later split in 1966 into Mountain Province, Benguet, Kalinga, Apayao and Ifugao.
Mountain province is known for its mummy caves which contain naturally mummified bodies which probably became so due to the humid atmosphere. The hanging Coffins are also found in the province, these are literally coffins hanging on to the branches of trees, many tourists claim there is no foul odor, the bodies were probably mummified by the atmosphere according to theory.
Based on the 2000 census survey, 52% of the population are Kankana-ey. Other ethnic groups living in the province are the Balangao 13.6%, Ibontoc 12%, and other ethnicity comprise about 21.6% of the province's population.