François-Alphonse Forel was a Swiss physician and scientist who pioneered the study of lakes, and is thus considered the founder, and the Father of limnology. Limnology is the study of bodies of fresh water and their biological, chemical, and physical features.

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.