Lachung Monastery is a Nyingma[1][2] Buddhist gompa in the Lachung Valley in Mangan district in Northeastern Indian state of Sikkim.

The word Lachung means "small mountain".

The village is 118 km from Gangtok on the North Sikkim Highway and is the last one before the Indo-Chinese border.

The monastery hosts a famous mask dance each year.

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