屋おく内ないプール

noun

indoor swimming pool

Refers to a swimming pool located inside a building, as opposed to an outdoor pool (屋外プール).

• このスポーツクラブには屋おく内ないプールがあります。

  This sports club has an indoor swimming pool.

• 冬ふゆでも屋おく内ないプールで泳およげます。

  You can swim in the indoor pool even in winter.