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Thẩm Mã Pass

Thẩm Mã Pass (also called Dốc Chín Khoanh, the 'nine-bend slope') is a dramatic, historically named mountain pass on Highway 4C between Yên Minh and Đồng Văn on the Hà Giang Loop - one of the route's most famous photo stops, which also means it's one of its most crowded, especially during the Sep-Nov buckwheat flower season.

MotorbikeNine-Bend PassPhotographyRice Terraces
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Overview

Best Time to Visit
Sep - Nov (golden rice terraces, then buckwheat flowers later in the window) or Mar - Apr (spring flowers) are the classic seasons. Fair warning: Sep-Nov, especially weekends during peak buckwheat season, is also when this pass gets its worst traffic - documented cases of 30-minute-plus jams have made local news. Weekday visits are far more pleasant if your schedule allows. Within a day, the best light is early morning (around 6-8 AM, often with mist for a softer look) or late afternoon (roughly 4:30-5:30 PM, golden light good for sunset shots)
Entry Fee
Free
Opening Hours
Open 24/7
Address
Thẩm Mã, Đồng Văn, Hà Giang

Things to Know

Crowds
One of the most famous, and most crowded, stops on the Hà Giang Loop - increasingly busy each year, with severe weekend traffic during peak buckwheat season (roughly Sep-Nov) that has made local news for jams lasting 30 minutes or more
Safety
No dedicated car parking; vehicles park along the roadside, so exercise caution when stopping, especially during busy periods when traffic backs up. Use a low gear on the ascent and descent, never stop mid-curve, and slow down with headlights on if fog rolls in. A 2026-reported scam involves being offered a flower bouquet to hold for photos, then being charged (sometimes up to 200,000 VND) once you've taken it - confirm anything is free before accepting it
Seasonal
Sep-Nov brings golden terraces and buckwheat flowers but also the heaviest crowds; Mar-Apr offers spring flowers with a generally calmer atmosphere

About This Place

What Makes Thẩm Mã Pass Special

Thẩm Mã Pass sits on Highway 4C between Yên Minh and Đồng Văn on the Hà Giang Loop, one of the route's signature stops thanks to its nine dramatic switchback bends (giving it the alternate name Dốc Chín Khoanh, 'Nine-Coil Slope'). The pass crests above a wide valley of terraced fields hemmed in by limestone karst, with the Đồng Văn plateau opening up ahead - one of the moments on the loop where the landscape shifts from forested mountain to open rocky plateau. The name Thẩm Mã has a specific historical origin: it was traditionally the slope where pack horses carrying goods were tested for strength, with those that reached the top still strong kept as working animals, while weaker ones met a different fate at highland markets. A second, more romantic legend attached to the same pass holds that couples who cross it hand in hand are destined to stay together for life. It's about 112km from Hà Giang city, roughly 3 hours by motorbike via Quản Bạ and Yên Minh. Precisely because it's this scenic and this storied, Thẩm Mã has become one of the most popular photo stops on the entire loop, often photographed from the famous 'Z-bend' viewpoint where the full run of switchbacks - sometimes likened to a ribbon of silk draped across the mountainside - comes into view, with H'Mông village rooftops visible in the valley below. That popularity means it's also one of the more crowded stops on the route, particularly during the Sep-Nov buckwheat flower season and on weekends, when traffic here has made local news for extended jams.

How to Get There

Getting There

Thẩm Mã Pass is on Highway 4C, on the stretch of the Loop road between Yên Minh and Đồng Văn (via Phố Cáo). Riders doing the standard loop clockwise from Hà Giang city pass through it on day 2 or 3, after Quản Bạ and Yên Minh. There's no reason to make a special trip - it's a natural part of the route. Be aware that this stretch can see significant traffic during peak season weekends, so build in extra time if you're travelling then.

What to Expect

On the Ground

The pass has a small viewpoint area at the top where riders typically stop for photos, along with roadside stalls selling drinks and snacks, and often local children with handmade flower garlands for sale. The view takes in terraced valleys dropping away to the south and the rocky karst plateau stretching north toward Đồng Văn. The road itself is well-surfaced with manageable corners, though loose gravel can appear on some bends. During quieter periods (weekdays, off-peak season) the atmosphere is genuinely peaceful; during peak buckwheat season weekends, expect a busy, sometimes congested scene with many other travellers stopped for the same photos.

Travel Tips

Tips

Don't rush through Thẩm Mã in the race to reach Đồng Văn - the views here are genuinely worth 20 minutes, provided you time it to avoid the worst crowds. Given its fame, this is a place where an early morning or weekday visit makes a real difference to the experience; arriving on a Saturday afternoon during buckwheat season risks getting caught in the kind of traffic jam that has made local news. It's also worth going in with eyes open about the pass's growing pains: as more informal vendors and photo-prop services have set up along the roadside, some longtime visitors feel the spot has lost some of its original, unmediated character, and there are real local conversations about how to balance tourism income with safety, sustainable management, and the community's own connection to the land. None of that erases the pass's genuine visual drama, but it's part of an honest picture of what you'll find there today. If you're doing the loop over 3 days, Thẩm Mã typically falls on day 2 between Yên Minh and Đồng Văn overnight.

Insider Tips

Based on real traveler experiences and commonly mentioned advice from multiple visitors.

Give modest amounts if buying flower garlands from local children (around 20,000 VND is typical) - avoid excessive sums, which can inadvertently discourage school attendance
Stop at roadside cafes for ginger-honey tea or coconut coffee while enjoying the views
Visit during off-peak times (weekdays, early morning, outside Sep-Nov weekends) to avoid the worst crowds and traffic
This is one of the most famous, and consequently most crowded, viewpoints on the entire Hà Giang Loop - not a quiet alternative to Mã Pí Lèng. During peak buckwheat season (roughly Sep-Nov) and especially on weekends, traffic here has made local news for jams lasting 30 minutes or more. Visit on a weekday, or early morning, if you'd rather not be part of a queue
The name comes from an old practice: pack horses carrying goods were sent up this slope to test their strength - horses that reached the top still strong were kept as good working animals, while weaker ones that couldn't make it were destined for the pot at highland markets. It's also called Dốc Chín Khoanh ('Nine-Coil Slope') for its nine switchback bends
Local children are often around selling small handmade flower garlands (commonly around 20,000 VND each), and you may also find a boy playing the khèn (a traditional H'Mông pipe instrument) for tips - a modest, good-natured purchase or donation is appreciated, but avoid giving excessive amounts, since large sums can inadvertently encourage children to prioritise selling over school
⚠️ Separately, be aware of a specific scam reported in 2026: some people on the pass offer a flower bouquet for you to hold 'for free' as a photo prop, then demand payment once you've picked it up - sometimes as much as 200,000 VND. This is different from the legitimate flower-garland sellers; if in doubt, don't take hold of anything offered to you without first confirming clearly whether it's free or has a price
Riding technique matters here: use a low gear on both the ascent and descent, never stop your bike mid-curve, and if fog or mist rolls in, switch on your headlight and slow right down
The descent into Đồng Văn from Thẩm Mã gives some of the best karst plateau views on the entire loop
Road surface is good but watch for loose gravel on the corners, and be patient with traffic if you're here during a busy period
The viewpoint at the top has limited facilities, though roadside stalls sell drinks like ginger-honey tea and coconut coffee - still worth carrying your own water and snacks as a backup

FAQ

Common questions from travelers who've visited this place.

Is this viewpoint very crowded?›
Yes - it's one of the most famous scenic stops on the Hà Giang Loop, and during peak buckwheat season (Sep-Nov) weekends, traffic here has been severe enough to make local news, with jams lasting 30 minutes or more. Visit on a weekday or early morning for a much calmer experience.
How much should I give to local children selling flowers?›
A modest amount is appropriate - around 20,000 VND per garland is commonly cited. Avoid giving excessive amounts, since large sums can inadvertently encourage children to prioritise selling over school. Separately, watch out for a different, reported scam where someone hands you a flower bouquet to hold for a photo and then demands payment (sometimes up to 200,000 VND) - confirm anything is free before you accept it.
Where exactly is Thẩm Mã Pass?›
It's on Highway 4C, on the stretch of the Hà Giang Loop between Yên Minh and Đồng Văn, via Phố Cáo.
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