A lowland plain along the banks of the Mekong River, and the river is the most fertile in all 3 zones zone is the area of the garage, the garage, the country's major rice water. Called the plains of Vientiane across the Plains on the South field at Suwan fireballs and rank insignia se hiang and Plains Champasak in southern Laos, which appearing along the Mekong River, takes to the border