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Mountain lakes are known to geographers as tarns if they are caused by glacial activity. Tarns are found mostly in the upper reaches of the Himalaya, above 5,500 metres.
Trekkers attempting the Annapurna Circuit route usually cross the watershed between Manang and Kali Kandaki valleys over the 5414 meters high Thorong La pass. The alternate route skirting Tilicho Lake from the north has been gaining popularity. This route is more demanding and requires at least two nights of camping. There are two passes leading to Jomsom; Mesokanto La and Tilicho North pass known also as Tilicho "Tourist pass". These routes via Tilicho Lake are more often closed by snow than the higher Thorong La.
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![Tilicho lake_2. Annapurna Conservation Area, Central Nepal [SEE Tilicho lake_1, which is better]](http://web.archive.org./web/20101225021017im_/http://i.ytimg.com/vi/71ELKLFo-9c/2.jpg "Tilicho lake_2. Annapurna Conservation Area, Central Nepal [SEE Tilicho lake_1, which is better]")
