The trek begins at Uttarey (6,500 ft) and ascends to Chewa Bhanjang (8,860 ft) on the Sikkim-Nepal border, where a police check post exists on the Sikkim side. From thereon, the trek route keeps between the altitude of 12,000 ft to 14,000 ft with the highest point being the Dafey Bhir Pass located at an altitude of 14,450 ft high. The terrain along the trek route is, therefore, treeless, criss-crossing, steep, rugged rocky hills with grassy meadows forming flat plains at places. Within the folds of these fragile rocky slopes, one comes across several high altitude lake formations of turquoise green water considered pristine and sacred by both Hindus and Buddhists alike. Among these lakes, Ram and Laxhman, Lampokhari, Laxmi Pokhery and Zomlay Pokheries are some of the well-known sacred lakes, located along the main trekking route. At places, the trail leads through the rich rhododendron forests of many hues and colors. The trek route after Gomathang valley goes intermittently through forests of silver fir and rhododendron right upto the alpine plains of Dzongri.