Narongchai works on a tour boat on the Mekong River in Nakhon Phanom, Thailand, May 8, 2019. Narongchai, a volunteer tour boat guide on the Mekong River in northeast Thailand's Nakhon Phanom, has been doing this job for 16 years. "The Mekong is our mother river, binding everyone in the basin," said Narongchai, describing the cross-border river part of his life. TO GO WITH Feature: Mekong river binds regional countries, peoples together as lifeblood of Southeast Asia (Xinhua/Guo Xinhui)