Three quarters of Vietnam's territory consists of mountains and hills. Vietnam is divided into four distinct mountainous zones. In the core of the Mekong Delta, Ho Chi Minh City, formerly known as Saigon, is second the most important in Vietnam after Hanoi. The city is bathed by many rivers, arroyos and canals, the biggest river being the Saigon River. Ho Chi Minh City has various attractions as Ho Chi Minh Museum, formerly known as Dragon House Wharf, Cu Chi Tunnels, system of museums, theatres, cultural houses.
As for Hanoi, famous sites include the One Pillar Pagoda (built in 1049), the Temple of Literature (built in 1070), Hanoi Citadel, Hanoi Opera House and President Ho Chi Minh's Mausoleum. There are also 18 beautiful lakes such as Hoan Kiem Lake, West Lake, and Truc Bach Lake, which are the lungs of Hanoi, with their surrounding gardens and trees providing a vital source of energy. Many traditional handicrafts are also practiced in Hanoi including bronze molding, silver carving, lacquer, and embroidery. Hanoi has many famous traditional professional handicraft villages such as Bat Trang pottery village, Ngu Xa bronze casting village and Yen Thai glossy silk.