The Tiji Festival Trek is a popular trek in Nepal that takes place in the Upper Mustang region, and is known for its colorful Tiji Festival. The festival is a three-day celebration that takes place in the spring and is based on the Bon religion, an ancient pre-Buddhist religion of the Himalayas. The festival is celebrated to mark the victory of good over evil and to pray for a bountiful harvest. The Tiji Festival trek typically takes about 9-12 days, starting and ending in Kathmandu. The trek takes visitors through beautiful landscapes, traditional villages, and monasteries. Along the way, you will also pass through the ancient capital of Mustang, Lo Manthang. The Tiji festival trek is considered moderate to strenuous and best to be done with a guide and in a group.