Secrets of Upper Mustang: A Guide to the Last Forbidden Kingdom

Upper Mustang is one of those places that is easier to romanticise than to describe truthfully. The temptation to write "a lost kingdom where time stood still" is enormous. In reality, time did not stand still here — it simply moved along roads that bypassed the main routes. The region was closed to foreigners until 1992, and even today entry requires a special permit costing $500 for the first ten days. That immediately filters out casual visitors — and it may be the best thing that could have happened to Mustang.

The journey begins in Jomsom

The route starts in Jomsom — a small town at 2,700 m, reached by a short flight from Pokhara or by a winding drive up the Kali Gandaki valley. Beyond it, another planet begins. The green terraces of the middle Himalayas fall away behind you, and the landscape becomes high-altitude desert: ochre cliffs eroded by wind into fantastical shapes, the world's deepest gorge beneath your feet, and dry, transparent air that makes the mountains look closer than they are.

The trail follows walls hung with prayer flags, past chortens and rows of mani stones carved with the mantra "Om mani padme hum." The route demands reasonable physical fitness — you spend most of the trek above 3,000 m, passes rise toward 4,000 m, and daily elevation gain and loss can be exhausting. This is not a stroll. But it is not mountaineering either: there are no technical sections, only endurance and a sensible attitude to acclimatisation.

Lo Manthang — the capital that should not have survived

The heart of Mustang is Lo Manthang, the walled capital of the former Kingdom of Lo. Inside the walls stand whitewashed houses, 15th-century monasteries with frescoes restored by master craftsmen from across the Himalayan region, and narrow lanes where monks in burgundy robes make their way to morning prayers. Until 2008, a king formally ruled here — the last Raja of Mustang, whose dynasty dates to the 14th century. This is not a "living history" attraction; it is simply history that has not yet ended.

The memory many visitors carry home is not from the town itself but from its surroundings — cave complexes cut into sheer cliffs. Thousands of man-made cavities hewn into the sandstone at vertiginous heights; archaeologists have found mummies, Buddhist manuscripts, and paintings inside some of them that are more than a thousand years old. No one yet knows exactly who made them or why. You stand beneath that wall and realise how little we actually know about the people who lived here before us.

Tibet as it no longer exists in Tibet itself

Mustang is historically and culturally a part of Tibet, cut off by a political border. The locals speak a Tibetan dialect, follow Tibetan Buddhism of the Sakya school, and maintain the same way of life: barley, buckwheat, yaks, salt trade. The paradox is that many Tibetan traditions are better preserved here than on the other side of the Himalayas. When you sit with a local family over a bowl of salty yak-butter tea and a plate of momo, you understand that hospitality here is not a service — it is part of a worldview. You are fed not because you paid for a tour.

What you need to know before you go

• A permit is mandatory and can only be arranged through a licensed agency — solo travel without a guide and a group of at least two people is not permitted. This is not bureaucratic pedantry; it is a way of protecting a fragile culture from mass tourism.

• The best time is from late March to November. Unlike the rest of Nepal, Mustang lies in the rain shadow of Annapurna and Dhaulagiri, so the summer monsoon barely reaches it — a rare opportunity for trekking in the rainy season.

• Wind. After midday a strong, steady wind rises in the Kali Gandaki valley — setting out on the trail early in the morning is the wiser choice.

• Altitude. The route runs above 3,000 m with passes approaching 4,000 m — take acclimatisation seriously and do not rush your schedule.

Mustang does not reveal itself immediately and does not try to impress you. There are no Instagram cafes here and no softening filter between you and the place. There is wind, the ochre of the cliffs, white stupas against a blue sky, and the sense that you have landed in a very old and very real part of the world. For those who come for that — rather than for a box to tick — this is worth making the journey.