Mt. Kanchenjunga, the world's third highest mountain, lies on Nepal 's eastern border with Sikkim. The trek begins right after landing at a STOL airstrip at Taplejung and takes through fascinating villages and pristine forests to the awe-inspiring South Face Base Camp at Ramche at 4360 meter, before crossing to the north side of Kanchenjunga via the Mirgin La, the highest pass at 4663 meter. Glacial excursion around Ramche is truly an unforgettable experience. The return trek via Ghunsa is easier as most of the path passes along river valley.