Tonguez
A suffusion of yellow
There is zero other D&D Cambodian inspired setting, other zero other D&D Vietnam inspired settings, other zero other D&D Tibet inspired settings, zero Indonesian inspired D&D settings, zero other D&D Siberian settings. Only Kara Tur had the vision and the guts to go beyond the usual China and Japanese settings for D&D fans.
The setting has soooo much potential.
And the lead designers and writers of Kara Tur had a huge amount of respect for Asian cultures, they did not just reduce it to stuff inspired by Kung Fu movies or Anime, which could easily have happened.
dont forget 3e Mahasarpa, although most people associate it with India in a 2001 tweet James Wyatt said "Fun Fact: For my own OA campaign, I set my adventures in the yuan-ti-infested ruins of Angkor Wat in a setting I called Mahasarpa"
I've also played in a Mahasarpa game inspired by Vietnam, so it does SE Asia pretty well