remote region; outlying area
Refers to a distant, often rural or undeveloped area far from urban centers. Can carry a nuance of being isolated or hard to reach.
He grew up in a small village in a remote region.
Electricity still hasn't reached that outlying area.
Compound of 辺 (hen, 'vicinity, border') and 土 (do, 'land, soil'). The exact historical derivation is uncertain, but the combination conveys the idea of a borderland or outlying territory.