Hạ Long also known as Hong Gai, Hon Gai and Hongay, is the capital city of Quang Ninh province, Vietnam. The city mainly lies on Bai Tu Long Bay, which is part of the Hạ Long Bay. It is located at about 160 km northeast of Hanoi. The population in 2010 was 221,580. (Source: http://en.wikipedia.org/wiki/Ha_Long)