Pakse, “mouth of the river”; is the capital and most populous city of the southern Laotian province of Champasak, making it the second most populous city in Laos. Located at the confluence of the Xe Don and Mekong Rivers, it has a population of about 88,000. It also served as the capital of the Kingdom of Champasak until it was unified with the rest of Laos in 1946. International Airport