The concept refers to entities, often supernatural in nature, believed to inhabit or be associated with oceans, seas, and other bodies of salt water. These entities can manifest in various forms across different cultures and belief systems, ranging from benevolent protectors of marine life to malevolent beings that cause storms and shipwrecks. Legends surrounding these figures often depict them as powerful forces capable of influencing human affairs, particularly those related to maritime activities. As an example, mermaids and mermen, found in folklore worldwide, represent a common manifestation of this general idea.
The significance of these beliefs lies in their impact on human interactions with the marine environment. Historically, understanding and appeasing these perceived powers was considered crucial for ensuring safe passage, bountiful catches, and overall prosperity dependent on the sea. This understanding shaped cultural practices, rituals, and taboos related to fishing, navigation, and coastal living. This perspective provided a framework for explaining unpredictable natural phenomena and for fostering a sense of respect, even fear, towards the vast and often unforgiving ocean.