Nong Khai (Thai หนองคาย) is the one of the
north-eastern provinces (changwat) of Thailand.
Neighboring provinces are (from south-east clockwise)
Nakhon Phanom, Sakon Nakhon, Udon Thani and Loei. To the
north it borders Vientiane Province, Vientiane
Prefecture and Bolikhamxai of Laos. The province is
located in the valley of the Mekong river, which also
forms the boundary with Laos. To the south it has some
highlands. The Laotian capital Vientiane is only 25
kilometers away from the provincial capital Nong Khai.
The Thai-Lao Friendship Bridge which connects them was
built jointly by the governments of Thailand, Laos and
Australia and was opened in 1994. The area of the
province changed ownership often, and it was part of the
Laotian kingdom Lan Xang as well as part of the Thai
kingdom Ayutthaya.
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