This trek covers the higher reaches of the Varsey Rhododendron Sanctuary in the South West Sikkim and covers the Khanchendzonga National Park as well. This trek offers spectacular view of the Khanchendzonga and the Everest ranges. The trail is rich in floral diversity and especially in spring, the rhododendrons are in full bloom with their yellow, pink and crimson bell shaped blossoms. The trek winds its way through the source of two rivers, which originate from moist grassy meadows. After Thulo Dhaap, the trail climbs up to the Singalelah Ridge and from Phoktey, one can experience the sunrise on the Everest and Khanchendzonga peaks. Trekking route passes through Singalila Range bordering with Nepal from where one will have the opportunity to see mountains of the the Sikkim , Eastern Nepal and Western Bhutan and Dzongri Area, Prek Valley and to touch the foot of Mt Kangchendzonga- GOECHALA- 4,950 m. from southern side.