Hai Phong is northern Vietnam's main port, and an important industrial and commercial center. Hai Phong is a beautiful city with much of the central colonial quarter still preserved. Many streets are bordered by flame flower trees, giving the city its other name 'city of flame flowers'. Hai Phong itself, the Du Hang temple, Hang Kenh communal houseand and the old quarter are worth visiting. Nearby Do Son beach is northern Vietnam's most popular seaside retreat. It even boasts a casino!