Darjeeling is also an absolute Arcadia for trekkers and adventure explorers. Trekking in Darjeeling is an lifetime experience that will take you through the sublime grandeur of Himalayas holding its vast treasures of the snow-capped mountains, valleys adorned with colorful rhododendrons, magnolias, orchids and ferns of numerous varieties. Trekkers can even enjoy the sights of varied color birds inhabiting in its dense jungles, there are about 600 species of birds nestling in the emerald green forests on the slopes of the mountains. Dzongri area of West Sikkim, Thingchen Khang and Jopunob, are best trekking zones and also been declared as the best "trekking peaks', Permits are required by foreigners for trekking on most of the routes in Sikkim.