Dur hot spring trekking starts from Bumthang passing through forests of Cyprus, juniper, spruce, hemlock and maple. Dur Hot spring trekking is a old expedition route to Gangkhar Puensum across several hot spring. This is an old expedition route to Gangkhar Puensum (mountain) through Trongsa, Bumthang. You will come across several hot spring where one can relax and shower in the mineral rich water.