expression, noun
isolated place; remote area; landlocked island
Figurative expression for a place that is cut off from surrounding areas, like an island on land. Often used for remote villages or areas with poor transportation links.
その村は山に囲まれた陸の孤島だ。
That village is a remote place surrounded by mountains.
新しい道路ができるまで、ここは陸の孤島だった。
Until the new road was built, this place was isolated from the rest of the land.