facing north; northern exposure
Describes a building, room, window, or site that faces north. Often used in real estate or when discussing sunlight and temperature.
This room faces north, so it's a bit cold in winter.
Soft light comes in through the north-facing window.
南向き describes something facing south and getting good sunlight, while 北向き describes the opposite direction, which tends to be darker and colder.
Compound of 北 (north) + 向き (facing, orientation). The reading きたむき follows standard kun'yomi.