Si Phan Don
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The Si Phan Don (meaning 4,000 islands) is a region of Champasak Province in southern Laos.
The Mekong river flows through the province and, just above the Cambodian border, is broken by the Khone Falls, a large number of rapids (including the Tat Somphamit rapids) which make this section almost impassable to river traffic. During French colonial times a narrow-gauge railway was once built for transportation across the rapids.
The Mekong below the falls has a population of Irrawaddy Dolphins.