Black Peak (6,387m) in Garhwal is a serious high-altitude climb via Gangotri that demands prior mountaineering experience. The 12-14 day expedition involves glacier traverses, ice climbing, and technical rope sections. Best done May-June or September-October. It's physically demanding and altitude is no joke, but the summit views across the Garhwal range are absolutely stunning. https://www.thinairexpedition.com/black-peak-expedition/