139 facts across 15 places. Each one has a source and the month we checked it, and we label legends as legends.
In 1010 Ly Thai To, ruler of the Ly dynasty, moved the capital of Dai Viet to the site of the old Dai La Citadel. The city that grew there was called Thang Long.
Ha Long Bay covers 1,553 square km and holds 1,969 islands of many sizes.
Fansipan stands 3,147.3 m (10,326 ft) high. It was originally measured at 3,143 m in 1909.
The Dong Van Karst Plateau Geopark covers 2,356.8 square km (910 square miles), at an average height of 1,400 to 1,600 m (4,600 to 5,200 ft) above sea level.
Hoa Lu was the capital of Vietnam from 968 to 1010. Ly Cong Uan, founder of the Ly dynasty, then moved the capital to Thang Long, now Hanoi.
The park holds about 300 caves and grottoes. A 2009 survey put the total discovered length of the cave system at about 126 km (78 miles).
From 1802 to 1945 Hue was the capital of Vietnam under the Nguyen dynasty, the dynasty that built the citadel you can walk through today.
The old town covers 30 hectares (74 acres). It holds 1,360 monuments and heritage sites, including 1,068 preserved houses.
The Tay Son uprising began in 1771, when three peasant brothers, Nguyen Nhac, Nguyen Hue and Nguyen Lu, revolted at Tay Son in Binh Dinh province.
Po Nagar is a Cham temple tower founded before 781. A stele dated 781 records King Satyavarman restoring the temple after it was damaged.
Da Lat sits 1,500 m (4,900 ft) above sea level on the Langbiang Plateau.
The Cu Chi tunnel complex in Ho Chi Minh City's Cu Chi District is 121 km (75 miles) long.
The Mekong Delta covers roughly 40,500 to 43,000 square km (15,600 to 17,000 square miles), depending on how its edge is drawn.
Phu Quoc covers 575 square km (222 square miles). It runs 50 km (31 miles) from north to south and is 25 km (16 miles) across at its widest.
Con Dao is a group of 16 mountainous islands and islets with a total area of 75.15 square km (29.02 square miles).