Nhiu Co San Mountain

Nhiu Co San rises to about 2,965 m in the Hoàng Liên Sơn range, in the Bát Xát area of Lào Cai. It is usually listed ninth among Vietnam's highest peaks, after Fansipan, Pu Si Lung, Pu Ta Leng, Ky Quan San, Khang Su Van, Ta Lien Son, Ta Chi Nhu and Po Ma Lung.

It is also called Sừng Trâu (Buffalo Horn), after its Hmông name: from a distance the mountain shows two peaks curving up like a giant pair of buffalo horns, which has earned it the nickname "buffalo king of the northwest". In the Hà Nhì language, Nhìu Cồ San is said to mean "three big mountains".

Ong Chúa Waterfall and Changing Landscapes

Ong Chúa (Queen Bee) waterfall is the symbol of Nhiu Co San. It drops from a cliff hundreds of metres high - not a powerful torrent but thin white streams spilling over tiers of old mossy rock, said to look like bees beating their wings in the forest. Around it, the landscape keeps changing: Hmông villages and fields at the bottom, low hills with shrubs, grassland and cliffs, then primeval forest with huge trees, red ferns, cardamom, lichens and maples that turn gold in autumn, and finally bamboo and moss forest near the summit, where old rhododendrons flower in spring.

Most trekkers take a sleeper bus from Hanoi at around 10 PM, arriving in Lào Cai city at 3-4 AM. A local bus at about 5:30 AM reaches the Dền Sáng junction around 7:30-8 AM, where porters usually meet their groups. Some small groups ride their own motorbikes to the junction instead - cheaper, but cold, foggy and full of potholes, with visibility sometimes down to a few metres on the way back after dark. Several sections of road from Lào Cai were badly damaged by Typhoon Yagi.

From the junction, a local xe ôm covers the last 7-8 km to Nhìu Cồ San village on a mountain track strewn with huge rocks. It's become a trademark of the trip - many trekkers joke that the xe ôm ride is scarier than the climb - and it gets slippery in the rainy season.

Nhiu Co San is usually rated "not too hard, not too easy" - about 5/10, doable for beginners who have trained, though steeper and rockier than easier peaks such as Lảo Thẩn. Sources put the round trip at roughly 17-22 km, so plan for about 20 km, around 90% of it uphill on the way in. Day 1 is usually 5-6 hours from the village to the huts at around 2,500 m. On day 2 you climb before dawn, about 1.5-2 hours along a stream and through ghostly moss forest, to the summit for sunrise, then descend.

Two Routes: Ong Chúa Waterfall and the Goat Pasture

The Ong Chúa waterfall route runs through forest with rich plant life, streams and wooden bridges. The walk from the village to the waterfall along the forest edge is fairly gentle; the steepest climbing, with big high steps, starts after the waterfall, and legs often feel it after lunch there. The goat pasture route (Bãi Dê) crosses open, bare hills with little shade but wide views over the valley and villages.

Accounts of it differ: some find it gentle with few views, others find the continuous descent the hardest part on the knees, especially in the rain. Many groups go up via the waterfall and down via the goat pasture.

Huts, Sunrise and the Summit

Both routes share one hut area about 1.5 hours below the summit, so space can run short at busy times. Sunrise is visible from the huts, but the summit blocks the sunset there. On top, the summit is open with a decent 360-degree view, and on a good morning you look out over a sea of cloud drifting between the ranges. There's no phone signal or electricity on the mountain, nights are cold, and clear nights are excellent for stars.

Tours cost around 2,700,000-4,000,000 VND per person (2026) with operators such as Tổ Ong Adventure, Viettrekking and Travel Up. Foreign visitors may face additional entry requirements because the route is in a restricted border area - confirm with an established operator well before your trip. Porters from Sàng Ma Sáo carry the heavy bags and are often praised for their cooking.

• Grippy trekking shoes, a comfortable backpack and comfortable clothes
• Light snacks and water for the day; porters carry the heavy loads
• Knee braces and trekking poles for the descents
• Warm layers - it's very cold at night, especially in winter
• A power bank, since there's no electricity on the mountain
• If you've never trekked before, train seriously first or try an easier 2 days 1 night peak