A basin — a low-lying area surrounded by mountains (geographical feature), often affecting local climate and agriculture.
長野県のいくつかの町は盆地に位置している。
Several towns in Nagano Prefecture are located in basins.
盆地は夏に暑く冬は寒くなりやすい。
Basins tend to be hot in summer and cold in winter.
この盆地は周囲を山に囲まれているため霧が発生しやすい。
Because this basin is surrounded by mountains, fog often forms.