'Maharashtra's Kalavantin Durg trek, one of the most daunting,' says Anand Mahindra Anand Mahindra, chairman of Mahindra Group, contemplates taking on the daunting challenge of trekking to the summit of Kalavantin Durg in the Western Ghats. The trek is known for its steep incline. Meanwhile, users question the safety of trekking in the rain.