The capital of Laos is Vientiane, which was founded 13th century. Vientiane has been the capital since 16th century.
Vientiane is the largest city in Laos and functions as: Houses the Presidential Palace.
Vientiane is located at 17.9757° N, 102.6331° E, at an elevation of 570' ft.
Source: https://flic.kr/p/8rj3uZ