The Flaming Mountains are barren, eroded, red sandstone hills in the Xinjiang Uygur autonomous region. They lie near the northern rim of the Taklamakan Desert. Their striking gullies and trenches caused by erosion of the red sandstone bedrock give the mountains a flaming appearance at certain times of the day. The best time to visit is from June to October. August is the best month as it is harvest time for local fruits, especially grapes.