Mangan is the capital of North Sikkim.
The sleepy town of Mangan happens to be the district headquarters of North Sikkim. It is also the gateway to the northern towns of Sikkim, places like Yumthang, Katao, Chungthang, Lachung and Lachen. Mangan happens to be the only place from which one can see the traditional inhabitants of Sikkim, the Lepchas, from very close range. This, because the Lepcha reservce of Dzongu of a mere 10km from the place.
Mangan can be reached from Siliguri by passing through Rangpo, Singtham, Dikchu and Makha. In fact, the town lies in the route which connects Gangtok with the extreme northern towns of Sikkim, like Lachen, and Lachung.
Jeeps are available from Siliguri to Mangan.
Mangan can also be from Gangtok. Shared jeeps and taxis are available.