Ask the sea in the middle of the earth
the Mediterranean sea
the Atlantic sea
Mediterranean Sea
Mediterranean Sea
terra
Chumas Region was a fictional region created by J.R.R. Tolkien in his Middle-earth legendarium. It is mentioned in his works, such as "The Lord of the Rings," and is located in the eastern part of Middle-earth near the Sea of Rhun. It is a sparsely populated region inhabited by various wild creatures and peoples.
The Red Sea
The most western sea is the Sundering Seas (aka Belegaer or The Great Sea) that separated Middle-earth from Valinor.
The name Mediterranean sea comes from mdei meaning middle and terra meaning earth, so it literally means middle earth sea.
The region in Earth's interior where convection currents occur is called the mantle. Convection currents in the mantle are responsible for driving plate tectonics and shaping Earth's surface features through processes like subduction and sea-floor spreading.
It must be the Mediterranean, surely - median, meaning situated in the middle, terrestrial, meaning of or on or relating to the earth....