This is the 2095th most frequent Japanese word.
基地
Base; military base.
In this sentence, "基地" refers to a physical military base or installation.
その基地は海の近くにあります。
That base is near the sea.
Here, "基地" is used metaphorically as a place or shelter created by the children.
子供たちは公園に秘密基地を作った。
The children built a secret base in the park.
In this usage, "基地" highlights the base as an institution with specific functions or equipment.