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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 the de facto capital of the island as well as the regional seat of government. The former President of Laos, Khamtai Siphandon has a residence on the island, which is a possible explanation for the high-quality of infrastructure, such as asphalted roads and electricity, on Khong Island. Locals tend to travel on longtail boats.
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 nearby Don Det and Don Khon islands, where it is possible to view the Khone Phapheng Falls.