Most of the western border of Laos is demarcated by the Mekong River, which is an important artery for transportation. The Dong Falls at the southern end of the country prevent access to the sea, but cargo boats travel along the entire length of the Mekong in Laos during most of the year. Smaller power boats and pirogues provide an important means of transportation on many of the tributaries of the Mekong.
The Mekong has thus not been an obstacle but a facilitator for communication, and the similarities between Laos and northeast Thai society—same people, almost same language—reflect the close contact that has existed across the river for centuries. Also, many Laotians living in the Mekong Valley have relatives and friends in Thailand.
the Mekong and its tributaries cover only about 20% of the land area.
Only about 4% of the total land area is classified as arable. The forested land area has declined significantly since the 1970s as a result of commercial logging and expanded swidden, or slash-and-burn,
farming