Vaiya, Ekkaia, the Enfolding Ocean, the Encircling Sea (
Outer space) — A dark sea that surrounds the world before the cataclysm at the end of the
Second Age. Vaiya flows completely around the world, forming a sea below it and a form of air above it. Arda is described as floating on Vaiya, like a ship on a sea.
Ulmo the Lord of Waters dwells in Vaiya, below the roots of Arda. Vaiya is described as extremely cold: where its waters meet the waters of
Belegaer in the northwest of
Middle-earth a chasm of ice is formed, the
Helcaraxë. Vaiya cannot support any ships except the boats of Ulmo: the ships of the
Númenóreans that tried to sail on it sank, drowning the sailors. The Sun passes through Vaiya on its way around the world, warming it as it passes. After Arda was made round Vaiya apparently disappeared, although it may have been changed into the upper
atmosphere of the world.