Which word identifies a large natural or human-made lake used to supply water?

marsh

pond

reservoir

wetland

Reservoir

Explanation:

Reservoir is a large natural or human - made lake used as a source of water supply.

reservoir

Explanation:

A reservoir is a large natural or human made water body, that is there for water supply of the cities and human activities that are located near that reservoir, they are often used for agriculture and to provide with fresh water the cities near the reservoir.