Poseidon is the god of the sea, earthquakes, and storms in Greek mythology. His kingdom is often referred to as the Poseidon realms. When speaking of this god's kingdom, various synonyms can be used to describe it. Words such as marine domains, oceanic spheres, aquatic territories, and watery provinces can be used to describe his vast kingdom. Other synonyms for Poseidon's realms include sea-lands, aquatic realms, marine empires, and oceanic kingdoms. These words paint a vivid picture of the vastness of Poseidon's domain and his immense power over the oceans and all the creatures that inhabit them.