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                   Laos is situated in the rugged mountainous interior of the indochina peninsula,an extension of the vast Asian landmass to the north. the eastern part of Laos,bordering on Vietnam, lies along the high ridges of the Annamese Cordillera.the rugged plateaus and mountains in the nort and east range in height from 500 to 4,000 ft.(150 to 1,200m.). in places, limestone under the plateaus is eroded into karsts-areas honeycombed with fantastic fissures,caves,and underground channels.

                Climate.   the country's climate is generally warm. Temperatures rang from about 82*F.(82*C.) in summer to between 60*and 70*F.(15*and 26*C.) from November through February. March April are usually dry,hot months.from  May to Octber, Southwest monsoon wind deposit about 10 in (25cm.) of rain each month during the dry season, from november to April, rainfall averages less than 1 in. (2.5 cm.).