mountainous region; hilly area
Refers to an area characterized by mountains or hills, often used in geography, weather forecasts, and travel contexts.
In the mountainous areas of this prefecture, a lot of snow falls in winter.
山地の気候は平地よりも涼しい。
The climate in mountainous regions is cooler than on the plains.
Mountainous terrain stretches across this region.
The village is surrounded by mountainous terrain.