It spans a large area along the Tam Đảo range and administratively belongs to 6 districts and 1 city: Lập Thạch, Tam Dương, Bình Xuyên and the city of Vĩnh Yên of Vĩnh Phúc Province; Sơn Dương of Tuyên Quang Province; Đại Từ and Phổ Yên of Thái Nguyên Province.

The highest summit is Tam Đảo North with an altitude of 1592 m. Three other peaks in the area include Thien Thi at 1375 m, Thach Ban at 1388 m and Phu Nghia at 1300 m. Sharp peaks with sloping sides and numerous, deep partitions are characteristic of the topology.

At an elevation of 930 metres, Tam Đảo town was established by French colonists in 1907 as a tranquil hill resort in northern Vietnam.

The boundary of the national park is located at an altitude of 100 m around the Tam Đảo range.

There now remain a stone church, some villas and palaces built by French colonists.

It has Thac Bac (The Silver Fall), Rung Rinh peak and Tam Đảo 2, a remnant of another resort built many years ago.