Tai Tam Country Park is nestled in the eastern corner of Hong Kong Island. From Jardine's Lookout in the north, it sprawls across rolling slopes of The Twins to end at the southern border on Stanley Gap Road. The western border lies in Wong Nai Chung Gap, while Tai Tam Road marks its eastern boundary. Designated in 1977, the park occupies a total area of 1,315 hectares, or one fifth of Hong Kong Island's land area.

There are 4 reservoirs in Tai Tam Country Park, and they are key water storage facilities of the Island in early years. Known as the Tai Tam Group, it comprises Tai Tam Upper Reservoir, Tai Tam Byewash Reservoir, Tai Tam Intermediate Reservoir and Tai Tam Tuk Reservoir. Built between 1889 and 1917, these reservoirs have an aggregate capacity of 9 million m3. Also in the park are remnants of war, such as forts, magazines and wartime communal stoves. Tai Tam was a bloody battleground during WWII. Here, the invading Japanese met strong resistance from the defending British troops.