storage location; depository; storage area
A place where items are kept or stored, often used in official or logistical contexts.
The storage location for hazardous materials is locked.
Please tell me where the documents are stored.
倉庫 is a warehouse or storehouse, a physical building, while 保管場所 is a more general term for any storage location.
収納 refers to the act of storing or putting things away, whereas 保管場所 is the place itself.
Compound of 保管 (storage, safekeeping) and 場所 (place, location).