While traveling to North-Eastern states like Assam, Meghalaya and Tripura, tourist doesn’t require to take any permits for visits. Possibilities are there that you need to register upon your arrival and departure. Due to strategic geographical location, tourist does need to acquire Restricted Area Permit while entering other North-Eastern states like Arunachal Pradesh, Manipur, Mizoram and Nagaland.
A minimum of four people can travel together to states like Arunachal Pradesh, Manipur, Mizoram and Nagaland, where travel permission is required to visit. Moreover, the group has to be sponsored by a government approved travel agency. The permits costing around Rs 300-400 can be issued between 2 days to 2 months, and are valid only for 15 days.
For foreign travelers visiting Sikkim (bordering China), permits are readily available free of cost. But, while touring north Sikkim, an Inner Line Permit is required, which is issued only to group of four travelers, that too through tour operators.
