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If you go to the Earth Explorer web site you can download several DEMs. For Nepal they have the 30m AsterGDEM and the 90m Void Filled SRTM. The 1 arc second (30m) SRTM is not available yet (12/12/2014) but I believe it should be ready in the near future
Theres SRTM data available. See https://en.wikipedia.org/wiki/Shuttle_Radar_Topography_Mission for more information. Note that SRTM hat a ground resolution of approx. 30 or 90 meters ( 1 and 3 arc-seconds, respectively). That is probably the highest-resolution free dataset available. For more detailed DEMs you should contact local Nepali ...
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