reservoir

/'rezəvwɑː(r)/　/'rezərvwɑːr/　noun   ため池･貯水池

★ a natural or artificial lake where water is stored before it is taken by pipes to houses, etc.

・The water content of the country's reservoirs had fallen to less than 50% of their capacity.

・They got up early and went for a swim in the reservoir.

store   /stɔː(r)/   /stɔːr/　n)蓄え、保管庫、店

content　/'kɒntent/　/'kɑːntent/　n)中身、内容、容量