A habitat is an area where an organism lives. An organism finds food, shelter, and everything else it needs to live within its habitat. Aquatic habitat is a habitat with water. It includes areas that are permanently covered by water and surrounding areas that are occasionally covered by water.
Freshwater habitats are aquatic habitats with low levels of salt, less than one percent. They include rivers, lakes, streams, ponds, swamps, wetlands, bogs, and lagoons.
Marine habitats are aquatic habitats with salt concentrations of more than one percent.