'''North Sikkim''' is in Sikkim.
Regions
The region of the Yumthang ,Yumesamdong,Gurudongmar and Chopta Valley is the only part of North Sikkim that is accessible for tourists. Since North Sikkim is an area of significant military presence (bordering Tibet), tourists may only visit with a guided tour, who must arrange a travel permit. Most organised tours are for 2-3 nights, costing $30 USD per day.
Cities
Mangan - the district capital
Lachen - located in the Chopta Valley.
Lachung, located in the Yumthang Valley is the major tourist destination.
Other destinations
Yumthang Valley
Lachung Gompa
Understand
Previously both foreigners and domestic Indian tourists were not permitted to enter North Sikkim. Although photography is now permitted, it must be done with discretion, and is forbidden in military areas.
Talk
English is widely spoken, although Nepali is the most widely spoken language.
Get in
Entry to North Sikkim is only possible on a guided tour, and a travel permit must be organised in Gangtok 1-2 days prior to travel. All travel is by 4-wheel-drive as the roads are subject to frequent landslides. Although the distance from Gangtok to Lachung is only 120 km, travel takes 5-6 hours on account of the mountainous terrain. Nevertheless, the journey into the valley is stunning.
Get around
Tourists must be accompanied by a tour guide when travelling between towns. The towns can be explored by foot.
See
Lachen to Gurudongmar Lake.
The Yumthang Valley beyond Lachung is the major tourist attraction in the region. The colourful rhododendron bloom (May-June), soaring snow-capped peaks, and herds of wandering yaks makes this an idyllic location. The valley has a thermal spring, although the water can get quite dirty.
The Lachung Gompa is the region's largest Buddhist shrine, located on the hillside across from Lachung.
Yumesamdong, Zero point from Yumthang Valley.
Do
Short walks in the Yumthang Valley are highly recommended.
Eat
Simple Nepali, Indian and Tibetan food is offered at most of the guesthouses. The tibetan momos (dumplings) are a must.
Drink
Sampling the local millet beer (known as tongba or chang) with the locals is a great way of soaking up the atmosphere in Lachung. The Sikkimese beer "HIT" is popular for its high alcohol content.
Stay safe
Provided you stay away from military zones, there are few safety concerns in the region. Theft is uncommon.