Khang Su Van Mountain

Khang Su Van - also known as Phàn Liên San or U Thái San - rises to about 3,012 m on the natural border between Vietnam and China in Lai Châu province. It is usually listed fifth among Vietnam's highest peaks, after Fansipan, Pu Si Lung, Pu Ta Leng and Ky Quan San. Locals regard it as a natural wall protecting Vietnam's northern frontier.

The biggest reason trekkers come is border marker 79, at about 2,880 m, often described as the highest border marker in Vietnam. It sits under the Vàng Ma Chải border guard post's area, and reaching it is the emotional high point of the climb. The mountain itself lies in what is now Sì Lở Lầu commune (formerly Pa Vây Sử commune, Phong Thổ district).

Cardamom Forest and Ancient Tea Trees

The first stage of the climb runs through vast cardamom plantations growing under the forest canopy; at harvest time the whole forest smells of it. Higher up are ancient Shan tuyết tea trees, said by locals to be around 1,000 years old. Further on, old-growth forest, bamboo forest, streams and waterfalls lead up to the steep final section below the marker - a cross-section of the northwest's primeval ecosystem in a single climb.

From Hanoi it is about 390 km to Lai Châu city, by car, motorbike or bus. From Lai Châu city, head to Dào San and then on to Pa Vây Sử village - about 80 km and around 3.5 hours. The road is wide and easy, so driving or riding yourself is perfectly manageable.

Getting the Border Permit

Because Khang Su Van sits in a sensitive border zone, even Vietnamese trekkers need a permit. Apply at the Lai Châu provincial military command, bringing an introduction letter from your local authority and your ID card. Once approved, hand the permit to the Vàng Ma Chải border guard post before starting the trek. Tour operators usually handle the paperwork.

Khang Su Van is a newer trekking route for many people and is rated fairly hard. The round trip is roughly 20 km. About two-thirds of it is fairly flat walking through cardamom and forest; the remaining third is steep, continuous climbing, with sections some trekkers put at over 80 degrees. As one trekker who has climbed the top 15 peaks put it: water, waterfalls and slopes, slopes, slopes - but no detours and no false summits, just a hard push straight to the top.

Strong trekkers who aren't interested in photos can go up and down in a day, but most recommend 2 days 1 night. There are no proper huts near the summit, only cardamom-drying huts belonging to local villagers, so groups camp in tents, usually at around 2,500-2,800 m. On a clear morning, the camp and the summit are excellent spots for sunrise and cloud seas.

At the top, trekkers check in at the triangular summit marker of Khang Su Van, separate from border marker 79. The trail has many branches and is easy to get lost on, which is why a local guide matters even though the route is not technical.

Guided tours cost around 4,000,000-5,000,000 VND per person (2026) with operators such as Viettrekking, Wild Adventure and JTravel. Contact your operator, guide or porter shortly before the trip for the latest trail and permit updates.

How to Prepare for Khang Su Van

• Train with running, stair climbing, skipping and long walks; basic skills in moving over rough ground, camping and crossing streams help
• Trekking shoes with strong grip and waterproofing, gloves and protective clothing for forest and mountain
• Headlamp, rope and a small knife for forest use
• Tent, sleeping bag and heat patches for the overnight camp
• Filling, high-energy food such as chocolate bars, biscuits and dry rations - and enough water to reach the next refill point along the trail
• Cold and fever medicine, a basic first-aid kit and personal hygiene items
• An offline map with the trekking route downloaded, a power bank and a personal rubbish bag