(a) the ports and airports which alone shall be customs ports or customs airports for the unloading of imported goods and the loading of export goods or any class of such goods;

(aa) 1[ the places which alone shall be inland container depots for the unloading of imported goods and the loading of export goods or any class of such goods;"]. (b) the places whcih alone shall be land stations (b) the places which alone shall be land customs stations for the clearance of goods imported or to be exported by land or inland water or any class of such goods;

(c) the routes by which alone goods or any class of goods specified in the notification may pass by land or inland water into or out of India, or to or from any land customs station from or to any land frontier;

(d) the ports which alone shall be coastal ports for the carrying on of trade in coastal goods or any class of such goods with all or any specified ports in India.