Kathmandu is the largest city in Nepal and the launch-off point for treks to every region of the country. Langtang National Park offers some great trekking and is just 35km north of Kathmandu. The Langtang Trek is a 10 trek to Gosainkunda Lake a sacred lake surrounded by peaks. The high point in the national park is Langtang Lirung at 7,245m.