Khammouane Province is a province in the center of Laos. Its capital lies at Thakhek. Khammouane Province covers an area of 16,315 square kilometres and is mostly of forested mountainous terrain. Many streams flow through the province to join the Mek

Luang Prabang, the ancient capital of Luang Prabang Province in northern Laos, lies in a valley at the confluence of the Mekong and Nam Khan rivers. Inhabited for thousands of years, it was the royal capital of the country until 1975.

Long District is a district of Luang Namtha Province in northwestern Laos.

Muang Sing is a small town and district in Luang Namtha Province, northwestern Laos, about 60 kilometres northwest of the town of Luang Namtha and 360 kilometres northwest of Vientiane.

The Nam Ou is one of the most important rivers of Laos. It runs 448 km from Phongsaly Province to Luang Prabang Province. The river rises in Muang Ou Nua, near the Lao-Chinese border and traverses the northern Laos mountains and gorges until meeting

The Phou Hin Poun National Biodiversity Conservation Area, formerly known as the Khammouane Limestone National Biodiversity Conservation Area, is one of 21 National Biodiversity Conservation Areas of the Lao People's Democratic Republic.

Vang Vieng is a small town north of Vientiane, on the Nam Song River in Laos. It's surrounded by striking limestone mountains and caves. Tham Poukham, to the west, is a cave with a blue-green lagoon and a reclining Buddha statue.