It was a officially restricted demilitarized zone until 1992, closely tied to Tibetan culture, which was strictly controlled by the Nepali government to preserve its unique environment and cultural heritage.

The primary attraction is the medieval walled city of Lo Manthang, the capital of the former kingdom. Other highlights include the spectacular barren, desert-like landscape, ancient Buddhist monasteries, incredible Sky Caves, and the deeply preserved Tibetan-influenced culture.

The best seasons are Spring (March to May) and Autumn (September to November), offering mild temperatures and clear skies. However, as it is in a rain shadow, it's also a great option during the Monsoon (June to August), when other trekking regions in Nepal are often wet.

No. Upper Mustang is a restricted area. All foreign trekkers must obtain the Restricted Area Permit through a registered trekking agency in Nepal and must be accompanied by a licensed guide. A minimum of two trekkers is generally required to apply for the permit.

The trek is generally considered moderate. It involves steady walking (5-7 hours per day) through dry, rocky, and often windy terrain. The maximum altitude is around $3800\text{ meters}$ in Lo Manthang, requiring proper acclimatization.

The most famous cultural event is the Tiji Festival, a three-day annual festival of traditional dance and mask work held in Lo Manthang, usually in May (the date varies based on the Tibetan lunar calendar).

Historically, the main way was trekking from Jomsom. Today, a motorable road extends throughout the region, allowing for jeep tours or motorcycle trips, alongside the traditional trekking route.