These large dunes facing the river valley are promoted as the highest dunes in the world.
这些面朝河谷的巨大的沙丘被认为是世界上最高的沙丘。
The country, though rugged and underdeveloped, is as large as France and is formed around the lush cradle of the Irrawaddy River valley, surrounded by highlands on three sides.
这个国家，尽管粗犷、未经开化，但同法国一样大，周边就是丰饶的伊洛瓦底河谷的发源地，三面环山。
These river valley areas, which are seasonally flooded, or have high water tables for a large part of the year, are an important dry season farmland.
这些河谷地带常发生季节性洪水，在一年的大部分时间内均保持较高的水位，是旱季重要的农田。
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