[n] a very remote and inaccessible place; "you'd have to go to the back of beyond to find one of those"
antipodean, antipodes, back, back-country, backwood, backwoods, backwoodsy, China, Darkest Africa, frontier, God knows where, godforsaken, godforsaken place, Greenland, hinterland, hyperborean, inaccessible, jumping-off place, North Pole, nowhere, out of