Jim Corbett National Park lies in the Nainital, Pauri Garwhal and Bijnore Districts of Uttaranchal.
The present area of the Reserve is 1318.54 sq. km. including 520 sq. km. of core area and 797.72 sq. km. of buffer area. The core area forms the Jim Corbett National Park while the buffer contains reserve forests (496.54 sq.km.) as well as the Sonanadi Wildlife Sanctuary (301.18 sq.km.)

The core is bounded to the North by the Kanda Ridge, with a height of 1043 m at its highest point. The entire area of the reserve is mountainous and falls in the Shivalik and Outer Himalaya geological region. It forms the catchment area of the Ramganga, a tributary of the Ganga.

The Ramganga flows from East to West in the reserve through landscapes of incredible beauty. Dammed at Kalagarh at the south-western end of the reserve in 1974. The reservoir created, submerged 40-sq. km. of prime grassland. The area on the western side of the reservoir now constitutes the Sonanadi Wildlife Sanctuary.

After India attained independence in 1947 the park was renamed as Ramganga National Park. In 1956, it was renamed as Jim Corbett National Park, in memory of Jim Corbett. Project Tiger, India's ambitious conservation program to save the tiger and its habitat was launched from Corbett in 1973.
Prior to the years 1815-20 of the British Rule, the forests of the Jim Corbett National Park were the private property of the local rulers. Though the ownership had passed into the British hands, the government paid little or no attention to the upkeep of the park. The sole aim was to exploit the natural resources and extract as much profit as possible from the jungle.

It was only in the year 1858 that Major Ramsay drew up the first comprehensive conservation plan to protect the forest. He ensured that his orders are followed strictly and, by 1896 the condition of the forest began to improve. Ramsays plan reflected the deep thought he had given to the science of forestry. In 1861-62 farming was banned in the lower Patlidun valley. Cattle sheds were pulled down, domestic animals were driven from the forest and a regular cadre of workers was created to fight forest fire and secure the forest from illegal felling of trees. Licenses were issued for timber and count of trees was undertaken. In 1868, the Forest department assumed responsibility for the forests and in 1879 they were declared reserved forest under the forest Act.