The Mekong river is the main geographical feature in the west and, in fact, forms a natural border with Thailand in some areas. The Mekong flows through nearly 1865 kilometers of Lao territory and shapes much of the lifestyle of the people of Laos .
In the south the Mekong reaches a breadth of 20 kilometers, creating an area with thousands of islands.
Climate :
Laos
enjoys a tropical climate with two distinct seasons; the rainy season
from the beginning of May to the end of September and the dry season
from October through to April. The yearly average temperature is about
28c, rising to a maximum of 38c during April and May. In Vientiane a
minimum temperature of 19c is to be expected during January. In
mountainous areas, however, temperature drops to as low as 14-15c
during the winter months, and during cold nights, can easily reach
freezing point. The average precipitation is highest in southern Laos,
where the Annamite mountains receive over 3,000 mm and in the northern
provinces only 1,000-1,500 mm.

