The Nanda Devi Base Camp Trek is a challenging 10-12 day expedition through UNESCO-protected wilderness to India's second-highest peak's base at 20,570 feet. Featuring glaciers, high-altitude valleys, and massive peaks, it offers restricted, sacred terrain with profound cultural significance. Best for experienced trekkers May-June and September-October with proper permits required. https://www.thinairexpedition.com/nanda-devi-base-camp-trek/