HNP – Thang Long-Hanoi lies at co-ordinate: 210 05 northern parallel of latitude, 1050 87 eastern meridians in the Red River delta triangle. Endowed with fertile land, Hanoi is defended by Tam Dao Mountain Range in the East and by Ba Vi-Tan Vien Mountain Range in the west.

HNP – Royal citadel is the area surrounding the royal palace and fourth of fifth open to the Eastern Gate. In the past, the East Gate spread to Hang Can-Hang Duong; Cua Dong Pagoda at 38 Hang Duong; Cua Dong Temple at 10 Hang Can. In the West, stele of Doi Pagoda was built at “The western gate of the west of the Forbidden City”. The Western gate, as said before, is located between Hung Vuong-National Assembly House The North (the current Northern Gate), the South: two gates, one in the side of Cua Nam Market, now looks towards Cua Nam flower garden and the other at the of the current Cot Co, straight the destroyed  Kinh Thien – Doan Mon - Cua Nam axis.