The sea. he is god of the sea afterall
Poseidon is King of the Sea. No god or goddess ruled him in his domain.
The island of Atlantis was his chosen domain - his domain was the Ocean
The sea. he is god of the sea afterall
Poseidon
He was the ancient Greek God of the sea. his domain was the Oceans
He is the god of the sea, because that was his domain and what he had power over.
Hades is the brother of Poseidon and with Zeus each of the three brothers hold domain over sky, sea, and the underworld.
Poseidon is the god of the seas, creator of horses, etc. Basically, his domain is the oceans, the rivers, the lakes.
Poseidon was best-known as the Greek god of the sea. He was also the god of earthquakes and the god of horses. So, if you are asking his domain with respect to where he lived, that would be in the ocean or on the ocean floor, although the primary gods also had residences on Olympus. If you are asking his domain with respect to what he ruled over as a god, that would be the sea, earthquakes, and horses.
Poseidon's domain is the ocean,. He is also known as Earth Shaker, God of the Sea, and Tamer of Horses. Everyone needs him because of the natures cycle.
Poseidon was associated with the domain of the sea. Zeus was associated with the domain of the sky and thunder. Hades was associated with the domain of the Underworld.
In Greek mythology, Poseidon is generally considered more powerful than Ares. Poseidon is the god of the sea and earthquakes, with control over vast forces of nature, while Ares is the god of war, more limited in his domain.