Section 9(1)(v) in The Conservation of Foreign Exchange and Prevention of Smuggling Activities Act, 1974
(v)such further or other Indian customs waters, or inland area not exceeding one hundred kilometres in width from any other coast or border of India, or such other customs station, as the Central Government may, having regard to the vulnerability of such waters, area or customs station, as the case may be, to smuggling, by notification in the Official Gazette, specify in this behalf.