noun, noun which may take the genitive case particle 'no'
north central region
Refers to the north-central part of a country, prefecture, or other geographical area. Often used in weather forecasts, regional descriptions, and administrative contexts.
明日は中北部で雪が降るでしょう。
It will snow in the north central region tomorrow.
中北部の市町村では人口が減少している。
The population is declining in the municipalities of the north central region.
中部 means 'central part'; 中北部 combines central and northern aspects.
Compound of 中 (ちゅう, 'central'), 北 (ほく, 'north'), and 部 (ぶ, 'part/region').