query: What is the capital of Vietnam?
passage: List of historical capitals of Vietnam
This list of historical capitals of Vietnam includes former capital cities as well as the current capital of Vietnam which is Hanoi in time order. The capitals in bold indicate long-term or important capitals in Vietnamese history while the capitals in italic indicate short-lived or transient capitals.
passage: Sài Gòn River Tunnel
The Saigon River Tunnel is an underwater tunnel that opened on November 20, 2011. It runs underneath the Saigon River in Ho Chi Minh City, the largest city of Vietnam. The tunnel was built with capital from JICA's ODA, in conjunction with a consortium of Japanese contractors. The tunnel connects the existing urban center of Ho Chi Minh City with Thu Thiem New Urban Area in District 2. The Saigon River Tunnel is part of the , an important road project under construction to ease the congestion of transport in the inner city as well as transportation from downtown to the Mekong Delta region. The existing downtown was previously only linked with the Thu Thiem New Urban Area by many bridges, namely: Thủ Thiêm Bridge, Phú Mỹ Bridge and Ba Son Bridge.