Lachen is 129 kms and Lachung is 124 kms.from the state Capital Gangtok.
On the way stop for sightseeing spots like Tashi View Point,Kabi Lungtsok, Naga Waterfall, the Confluence of Lachen Chu & Lachung Chu at Chungthang.
Lachen is a town in North Sikkim district in the Indian State of Sikkim. It is located at an elevation of 2,750 metres. The name Lachen means “big pass”. The town is being promoted as a tourist destination by the Sikkimese government. The town forms the base to the Chopta valley and Gurudongmar Lake. An annual Yak race, theThangu is held here in summer.
Lachen is about 129 kilometres (80 mi) from the capital Gangtok, and can be reached via a six-hour road journey. A short two-day-long trekking route also connects the Yumthang Valley to Lachen. It has a population of around 1,000. Lachen has its own system of rules and regulations known as Dzumsa. The heads of the Dzumsa are known as Pipon and Gyenbos.
To the north there is the old town of Thangu where the daytime temperature varies from 4 to 12 degrees Celsius (40 to 55 °F), even in the months of June and July.
Gurudongmar Lake can be reached from Lachen, a sacred lake in the Great Himalayas Region.
Lachung is a town and hill station in northeast Sikkim, India. It is located in the North Sikkim district near the border with Tibet. Lachung is at an elevation of about 9,600 feet (2,900 m) and at the confluence of the lachen and Lachung Rivers, both tributaries of the River Teesta. The word Lachung means “small pass”. The town is approximately 125 kilometres (78 mi) from the capital Gangtok.
The Indian Army has a forward base in the town. Before the Chinese occupation of Tibet in 1950, Lachung was a trading post between Sikkim and Tibet, after which it was closed down. The town’s economy has been boosted by tourism in recent years as the region has been opened up by the Indian government. Tourists come from all over the world to visit the town between October and May, mostly on their way to the Yumthang Valley and the Lachung Monastery.
Lachung has been described as the “most picturesque village of Sikkim” by British explorer Joseph Dalton Hooker in his definitive, The Himalayan Journal (1855). Skiing is conducted in Phuni near this town.
Summer Season : The summers in Lachen are pleasant and are preferred by the tourists. Summer season starts from the month of March and lasts till June. Temperature ranges between 10°C to 28°C during these months.
Monsoon Season : The monsoon season is from July to September and is not a right time to visit the place .
Winter Season : The winter season starts from October and lasts till February.The temperatue ranges between a chilling -5°C to 15°C.
Restricted Area Permit and Protected Area Permit Regime in Sikkim