Answers:
The Plain of Jars
Mekong River forms the boundry with Thailand 1750 km
and with Myrmar 235km
The mountains of the Annamite Chain form most of the eastern border with Vietnam.
There are some very interesting sandstone mountains with many caves near the city of Thakhek of Laos, across from Nakhorn Phanom Thailand.
Phou Bia at 9,242 feet (2,817 m) is the higest peak.
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