The island is 18 kilometres (11 mi) long (north-south), and 8 kilometres (5.0 mi) at its widest point. It has a population of approximately 55,000, mainly concentrated in the two villages Muang Saen (west) and Muang Khong (east); the latter is considered the de facto capital of the island. The former President of Laos, Khamtai Siphandon has a residence on the island, and explains the surprisingly high-quality of infrastructure, such as asphalted roads and electricity, on the island. Locals tend to travel on longtail boats.
The Khong island is noted for its natural beauty and is a growing tourist destination. Many tourists combine their visit to the island with a visit to the nearby Don Det and Don Khon islands, where it is easier to view the Khone Phapheng Falls. It is near the Cambodian border.