Nong Khai (Thai หนองคาย) is the northernmost of the north-eastern (Isan) provinces (changwat) of Thailand.

The province is located in the valley of the Mae Nam Kong (Mekong river), which also forms the border 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.

The provincial seal shows a pond with bamboo around it. The bamboo symbolizes stability, glory and continuity for the peaceful and fertile land.
The provincial tree is the tamalan or Burma pallisander (Dalbergia oliveri).

The province is subdivided into 13 districts (Amphoe) and 4 minor districts (King Amphoe). The districts are further subdivided into 115 communes (tambon) and 1099 villages.

Extracted from Wikipedia: Nong Khai Province