Check out this amazing drone video of Cambodia's largest waterfall, compliments of contributor and pilot Piak. It goes by various names: Sopheakmit, Lbak Khoun, and Preah Nimith. The falls are located on a waterway known as the Upper Mekong River in the northern part of this Southeast Asian country, near the border with Laos. It's part of the Preah Vihear Province, which covers much of the north-central part of Cambodia. The Mekong River is the principal waterway of the peninsula of Indochina.