A reservoir is an enlarged lake behind a dam, usually built to store fresh water, often doubling for hydroelectric power generation.
Kardzali Reservoir in Bulgaria is a reservoir in the Rhodope Mountains.
Lake Osceola on campus of the University of Miami in Coral Gables, Florida, May 2006
Some reservoirs such as this in Argos, Peloponnese are made for recreational purposes, rather than storing fresh water.
Lake Vyrnwy Reservoir. The dam spans the Vyrnwy Valley and was the first large stone dam built in the United Kingdom.
A lake is a naturally occurring, relatively large and fixed body of water on the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from the ocean, although they may be connected with the ocean by rivers, such as Lake Ontario. Most lakes are freshwater and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater. Lakes vary significantly in surface area and volume.
Lac Gentau in the Ossau Valley of the Pyrenees, France
Lake Michigan during a storm near the Ludington Lighthouse
The crater lake of Mount Rinjani, Indonesia
Lake Kaniere is a glacial lake in the West Coast region of New Zealand.
