How to Say "reservoir" in Spanish

Use 'depósito' for a general storage space, like a storage room or a warehouse, especially for non-liquid items.

Use 'tanque' specifically for a container designed to hold a large volume of liquid or gas, such as a gas tank or water tank.

Use 'estanque' for a small, often decorative, man-made body of water, like a garden pond or a small pool.

Use 'pantano' for a large, artificial lake created by damming a river, typically used for water storage or hydroelectric power.

Use 'embalse' for the body of water held back by a dam, synonymous with 'pantano' in many contexts but often preferred for the water itself.

While 'presa' primarily means 'dam', it can sometimes refer to the body of water held back by the dam, though 'embalse' is more common for the water.