Don Det (Lao: ດອນເດດ) is an island in the Mekong River in the Si Phan Don ("Four Thousand Islands") archipelago in Champasak Province of southern Laos.

[4] There is a Buddhist temple and two primary schools on the northern part of the island.

While the city is generally very warm throughout the year, it is noticeably cooler during December and January.

[6] The Khone Phapheng Falls, a succession of impassable rapids that gave rise to the construction of the railway, are among the main features accessible from Don Det.

[citation needed] Irrawaddy dolphins,[8][9] water buffaloes (Bubalus bubalis), common house geckos (Hemidactylus frenatus),[10] bronze grass skink (Eutropis macularia),[11] and bioluminescent beetles[12] can be seen in Don Det.