Bathing can take place in any situation where there is water, ranging from warm to cold. It can take place in a bathtub or shower, or it can be in a river, lake, water hole, pool, or the sea, or any other water receptacle. The term for the act can vary. For example, a ritual religious bath is sometimes referred to as immersion or baptism, the use of water for therapeutic purposes can be called a water treatment or hydrotherapy, and two recreational water activities are known as swimming and paddling.