There are certain places/regions in India that are designated as Restricted or Protected Areas to which access is limited and requires a special permit. For details about Protected Area Permits (PAP)/Restricted Area Permits (RAP), click here: mha1.nic.in/foreigDiv/PAP.html.
Please note that in partial modification of current procedure, the entire area of the State of Manipur, Mizoram and Nagaland from the protected areas regime notified under the Foreigners (Protected Areas) Order, 1958, for a further period of 2 (two) years beyond 31 December, 2013.
Visa applicants who wish to visit a restricted/protected area are required to fill an additional form that can be downloaded here. The processing of such applications can take up to 15 days and, in some cases, even longer.