The Langtang Valley is fully lies to the North of Kathmandu bordering Tibet. The Langtang trek offers the greatest diversity of Nepal. There is a series of nort-south running valleys that provide a variety of possible trekking routes. The Gosaikunda and Helambe region lie to its south; these can be combined with Langtang. Lantang range have famous 5 routes Gosaikunda, Gonjala pass, Helmabhu and Bhairab Kunda and lantang range itself. In the short period of time you can explores the all lantang region.