The plains of Bayou Area A flat area along Mekong river and in the river. The areas with the most fertile areas in the three county area is the breadbasket of the country. These began to appear along the lowlands of the southern plains known as the Nam Ngum Vientiane. Through Savannakhet into the lowlands. Situated south Ponce Ponce fireballs and Stripes Hiang. Plain and Champasak in southern Laos. Which appear along the Mekong River to finally take down the Cambodian border.