Flexi Says: The geography of Laos centers on the Mekong River basin and rugged mountain terrain. Laos is landlocked. Vietnam shields Laos from the South China Sea to the east and Cambodia to the south. The Mekong River flows through the land and provides freshwater, irrigation, and transportation. There are hydropower dams built on the Mekong river. This leads to floods and droughts, low water levels in the dry season, and a reduction in the amounts of sediment carried by the river that has harmful consequences on biodiversity.