The Sylhet valley is formed by a beautiful, winding pair of rivers named the Surma and the Kushiara both of which are fed by innumerable hill streams from the north and the south. The valley has good number of haors which are big natural depressions. During winter these haors are vast stretches of green land, but in the rainy season they turn into turbulent seas. These haors provide a sanctuary to the millions of migratory birds who fly from Siberia across the Himalayas to avoid the severe cold there.
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