Of all the mountain fortifications in the Sahyadris, Kalavantin trek is considered as one of the steepest climbs that can be quite a challenge for new trekkers. If you have been to Harihar fort near Nashik, you can consider Kalavantin as its closest sibling in the Panvel Zone of Sahyadri fortresses. No wonder experienced trek leaders will usually emphasize on climbing Kalavantin before one tries Harihar.