northwestern part; the northwest
Refers to the northwestern area of a region, country, or other geographical entity. Often used in weather reports, travel descriptions, and geographical contexts.
The northwestern part of Japan gets a lot of snow in winter.
The town is located in the northwestern part of the prefecture.
Refers to the southwestern part, while 北西部 refers to the northwestern part.
Compound of 北 (north), 西 (west), and 部 (part/section).