Most rivers in the country become only trickles during the long dry season and have large flows of water only in the spring, when the winter snow in the mountains melts rapidly. Most of the rivers end in lakes, swamps, or salt flats.  The country’s only navigable river is the Amu Darya, on the northern border, although ferry boats can cross the deeper areas of other rivers. The Amu Darya receives water from two main tributaries, the Panj and the Vakhsh, which rise in the Pamirs.
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