North Sikkim is the high-altitude district that begins north of Chungthang and extends to the Tibet border. It covers roughly 4,226 square kilometres but is sparsely populated — perhaps 45,000 residents across five towns (Mangan as the district capital, Lachung, Lachen, Chungthang and Dzongu) and dozens of small villages. Three different permit regimes govern entry: the standard Sikkim entry, the Protected Area Permit (PAP) for everything north of Chungthang, and the additional restrictions on Gurudongmar and Cholamu lakes (Indian passports only). All travel is by Sikkim-registered tourist vehicle with a beat-permit driver. This is the regional overview — what each town is for, which destination pairs with which base, and how to think about the trip shape.
The geography in one paragraph
The Teesta and Lachung Chhu rivers define North Sikkim. Both flow south, meeting at Chungthang (1,790 m) where the district administratively begins. Above Chungthang the road splits: the western branch follows the Lachen Chhu past Mangan (1,810 m, the district capital) into the Lachen Valley — Lachen town at 2,750 m, then up to Thangu (4,000 m), Chopta (4,000 m), the army gate at 4,900 m, and finally Gurudongmar Lake at 5,430 m. The eastern branch follows the Lachung Chhu into the Lachung Valley — Lachung at 2,750 m, then up to Yumthang Valley (3,564 m) and Zero Point (4,720 m). The Dzongu reserve sits west of the Lachen-Lachung split at lower altitude (1,000-1,800 m) and is administratively part of North Sikkim though it has its own permit regime.
The five towns
Mangan — the district capital
Mangan at 1,810 m on NH-310. The administrative headquarters of North Sikkim district. Most travellers pass through Mangan rather than stopping — it sits 65 km from Gangtok on the road to Chungthang. The Naga Falls 4 km from town and the Singhik Viewpoint just south are the local sights. Worth a half-day if you have it; not essential to the standard circuit. Best as a lunch stop on the drive up.
Chungthang — the river confluence
Chungthang at 1,790 m. The town where the Teesta and Lachung Chhu rivers meet, marking the formal start of North Sikkim district. Guru Padmasambhava is said to have left footprints in the rocks here in the 8th century, which gives the place its religious importance. The Chungthang Monastery sits above the river confluence. Most travellers stop for 30 minutes for the gompa and the river view, then continue north. The 2023 flood damaged parts of the town; reconstruction is ongoing.
Lachung — the Yumthang base
Lachung at 2,750 m on the right bank of the Lachung Chhu. A working Bhutia village of about 1,200 residents. Your base for Yumthang Valley and Zero Point — both 1.5 and 2.5 hours up from town respectively. The Lachung Monastery sits above the village. Apple orchards at the southern end. Stay 1-2 nights at one of the Bhutia-run lodges (Snow Lion, Lhakar Heritage, Sonam Palgay). Compact enough to walk end-to-end in 30 minutes.
Lachen — the Gurudongmar base
Lachen at 2,750 m. The acclimatisation village for Gurudongmar Lake. Smaller and quieter than Lachung. North-facing slope means the village gets the first afternoon shadow. Lachen Monastery above the village; a path down to the Lachen Chhu river. Stay one (minimum) or two nights — the second night gives much better acclimatisation for the Gurudongmar climb. Sleep early on Gurudongmar nights; departure is 4:30 a.m.
Dzongu — the protected Lepcha reserve
Dzongu at 1,000-1,800 m. A protected reserve for the Lepcha tribal community, accessible by a separate Dzongu Special Permit beyond the standard PAP. Currently restricted to Indian passports only. Stays are at family-run homestays — Mayel Lyang, Lingthem, Passingdang. The experience is genuinely slow — large cardamom plantations, river trails, traditional Lepcha architecture, no road traffic. Two nights minimum; ideally three. Best November to March for clear weather; avoid monsoon (heavy rain and leeches).
The six high-altitude destinations
Yumthang Valley (3,564 m) for rhododendrons and primulas. Zero Point (4,720 m) for the road-end-snow-desert experience. Shingba Rhododendron Sanctuary (3,000 m) for the species diversity. Gurudongmar Lake (5,430 m) for the highest navigable lake and the sacred-water experience. Cholamu Lake (5,330 m) for the experienced, well-permitted few. Thangu/Chopta Valley (4,000 m) for the high-altitude meadow walks and acclimatisation. See our separate post on the best places in North Sikkim for the deep dive on each.
How to combine the towns and destinations
3 nights — Lachung only (foreigners and families)
- Day 1 — Drive Gangtok → Lachung (6 hours via Mangan and Chungthang). Afternoon acclimatisation in village
- Day 2 — Yumthang Valley + Zero Point at dawn. Return to Lachung for lunch. Afternoon relax
- Day 3 — Drive Lachung → Gangtok (6 hours). Optional Mangan/Singhik lunch stop
4 nights — full Lachung-Lachen-Gurudongmar circuit
- Day 1 — Gangtok → Lachung (6 hours)
- Day 2 — Yumthang + Zero Point. Afternoon drive to Lachen (4 hours)
- Day 3 — Gurudongmar at dawn (4:30 a.m. departure). Return to Lachen for breakfast. Continue to Gangtok (7 hours total)
- Day 4 — Buffer day in Gangtok
6 nights — including Dzongu
- Day 1 — Gangtok → Dzongu (4 hours). Lepcha homestay
- Day 2 — Dzongu trails and cardamom plantations
- Day 3 — Dzongu → Lachung (5 hours via Mangan)
- Day 4 — Yumthang + Zero Point. Afternoon → Lachen
- Day 5 — Gurudongmar at dawn. Back to Gangtok
- Day 6 — Buffer in Gangtok
Permits explained
- Sikkim entry — Indians: no permit needed. Foreigners: Restricted Area Permit (RAP), processed at Rangpo or Bagdogra on arrival
- PAP (Protected Area Permit) — required for everything north of Chungthang. Processed at the Tourism Department in Gangtok, takes 1 working day. Group of 2+ minimum for foreigners
- Gurudongmar / Cholamu — additional Indian-citizenship requirement. Currently no foreign access
- Dzongu — separate Dzongu Permit issued at Mangan. Indians only. Apply with itinerary, photos, ID
- Nathu La (East Sikkim, separate from North) — Indians only, Wed/Thu/Sat/Sun
When to visit
October to mid-November is the prime window — clear weather, full road access, Gurudongmar reliably open, lowest altitude-symptom rate. Mid-March to mid-May for rhododendron bloom (Yumthang peaks late April-May). November as the quieter, cheaper alternative to October. Avoid mid-June to mid-September (monsoon, road landslides between Singtam and Mangan close the access) and late December through February (Gurudongmar closed, snow on roads, only Lachung side partially accessible).
Trip cost
- 3-night Lachung-only (foreigners or families): ₹26,000-38,000 per person
- 4-night full circuit including Gurudongmar: ₹38,000-52,000 per person
- 6-night with Dzongu: ₹48,000-68,000 per person
- All-inclusive — vehicle, fuel, driver, PAP processing, hotels with meals at North Sikkim homestays
- Premium tier with the better Bhutia lodges: add ₹15,000-20,000 per person
