Langtang Lirung is the highest mountain in the Langtang Himalayas. You reach very close to this mountain when you climb Kyanjin Ri during the Langtang Valley Trek.
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https://www.frolicadventure.com/langtang-valley-trek
https://www.frolicadventure.com/tamang-heritage-trek
https://www.frolicadventure.com/langtang-gosaikunda-trek
https://www.frolicadventure.com/gosaikunda-lake-trek