The term MEKONG NATIVE refers to people who live in the Mekong River Basin, which is located in Southeast Asia and spans parts of China, Myanmar, Thailand, Laos, Cambodia, and Vietnam. Specifically, the crossword solutions LAO (3 letters) and THAI (4 letters) refer to two of the countries in the region, Laos and Thailand, respectively. People from these two countries are considered Mekong Natives.