A lake is a large, relatively isolated body of freshwater or saline water that is surrounded by land. Lakes can vary greatly in size, depth, and temperature, and they can be natural or artificial.
Natural lakes are typically formed through geological processes such as glacial activity, tectonic movements, volcanic activity, or the erosion caused by rivers and streams. Artificial lakes, often referred to as reservoirs, are created by human activities, such as damming rivers for water supply, hydroelectric power, or irrigation.
Lakes can serve various ecological functions, including supporting diverse aquatic and terrestrial ecosystems, providing habitats for wildlife, and offering recreational opportunities for activities like fishing, swimming, and boating. They also play a role in the hydrological cycle, affecting local weather patterns and contributing to groundwater recharge.