airspace approach approximation area belt boundaries bounds bourns circumference circumscription closeness compass continental shelf convergence coordinates corridor country department district division edges environs foreground fringes ground heartland hinterland immediacy immediate foreground land limitations limits marches metes metes and bounds milieu nearness neighborhood nighness offshore rights outlines outskirts pale parameters part parts perimeter periphery place precinct precincts premises propinquity proximity purlieus quarter region salient section skirts soil space terrain territory three-mile limit twelve-mile limit verges vicinage vicinity zone