Foreigners are not permitted to visit restricted / protected areas, normally in remote border areas. Information about such restricted areas in India is available from Indian Missions / Tourist Offices overseas. Most of these areas in India are away from the normal tourist circuits.
Restricted Areas in India Where Permits Are Required-

Permissions to stay up to 30 days are issued on arrival at the airport in Port Blair. If you are arriving by sea, you need the permit in advance. As you need it to buy the ticket. It is advisable to get a permit while getting your Indian visa. It costs nothing and saves time later.

1). Municipal Area, Port Blair. 2). Havelock Island. 3). Long 4). Neil Island 5). Jolly Buoy 6). South & North Cinque 7).Red Skin 8). Entire Island of Middle Andaman (excluding tribal reserve) 9). All Islands in Mahatma Gandhi Marine National except boat, Holoday, Twin Islands, Tarmugli Malay, and Pluto 10). Entire Island of South Andaman (excluding tribal reserve) 11). Basatang Island 12). North Passage Island 13). Little Andaman Islands excluding tribal reserve 14). Mayabunder 15). Diglipur 16). Rangat 17). Mt. Harriet 18). Madhuban 19). Ross Island 20).Narcondum Island 21). Interview Island 22). Brother Island 23). Sister Island 24). Barren Island restricted to visit on board vessels.
Authority That Grants Permits:-

AMHA & FRROS
All Indian Missions abroad
Chief Immigration Officer, Chennai
Immigration Officer, Port Blair

Remarks: Places for 1 to 8 day and night visit allowed. Places from 14 to 24 only day visit allowed. Night halt in 9 subject to special permission of the U.T.Administration. Individual tourists are permitted, 30 days allowed.

Tourists may visit Bangaram and Suheli islands after obtaining a permit from the Lakshadweep Administration, Willingdon Island, Harbour Rd, Cochin-3.
For Agatti Island Indian National as well as foreigner need to obtain the entry permit.

Currently the following places require special permits. Arunachal Pradesh, Manipur, Mizoram, Nagaland, Sikkim and parts of Spiti. Theoretically, permits are granted to tourists in groups of four or more people on a tour arranged through a recognized travel agent. Permits allow for a maximum 10 day stay in each state.

Loktak Lake, Imphal, Moirang INA Memorial, Keibul Deer Sanctuary and Waithe Lake. Authority that can grant a permit: All Indian Missions abroad. All FRROs & MHA State Government of Manipur (Home Commissioner, Manipur).
Remarks: Calcutta to Imphal by air only, *Individual tourists not permitted, 6 days allowed.
Remarks: Calcutta to Imphal by air only.

Additional areas opened up:

Imphal-Bishnupur-Phubala, Moirang-Sendra-Keibul-Lamjao-Imphal
Imphal-Moirang-Lake Keibul-Lamjao-Chur-Chanderpur-Khuga-Imphal
Imphal-Litan-Ukhral-Shiroy-Sangsak-Imphal
Imphal-Thoubal-Waithu-Lake, Khonjam-Kakching-Thingjao-Waikhong-Sugnu-Imphal
Imphal-Khonghampat-Kanglatombi-Kangpokpi-Senapati-Karong-Mao Gate-Imphal
Imphal-Nonoh-Khongsang-Nungba-Jiribam-Imphal

FOREIGNERS ALLOWED ONLY IN GROUPS OF 4 OR MORE. 10 DAYS ALLOWED ENTRY BY ROAD ALLOWED ON NH39 & NH53 FOR DIMAPUR-KOHIMA-IMPHAL-JIRIBAM-SILCHAR.

MIZORAM (Protected Area)
Vairangte, Thingdawl and Aizawl
Authority that can grant a permit: Home Commissioner, Government of Mizoram, Aizawl, All FRROs at Delhi, Mumbai and Calcutta, Chief Immigration Officer, Madras and all Indian Missions abroad.
Remarks: Tourist groups may travel on the identified tour circuits only*Individual tourists not permitted, 10 days allowed.

Places for which permit is required: Itanagar,Ziro, Along, Deporijo Miao, Namdapha & Tipi Sujusha(Puki), Bhalukpong.
Authority that grants Permits:- Home Commissioner, Govt.of Aurnachal Pradesh, Itanagar
All FRROs at Delhi, Mumbai, Calcutta, Chief Immigration Officer Chennai, All Indian Missions abroad

INDIVIDUAL TOURISTS NOT PERMITTED, 10 DAYS ALLOWED . TOURIST GROUPS ARE TO TRAVEL ON IDENTIFIED TOUR CIRCUITS ONLY.

Additional Routes for Trekking Holidays in India Opened-up for foreign tourists :
Pasighat-Jengging-Yingkion
Bhalukpong-Bomdilla-Tawang
Roing-Mayodia-Anini
Tezu-Hayuling