| Category | Lexicon |
| Type | geographic lore |
The term Ten Seas refers to the salt-water seas and oceans of Midrêth. These are the Mephigax, Morwuld Briin, the Pearl Sea, Salzârrâk, Sea of Mourning, Erethor, Forbidden Sea, Nautrek, Edhelviel, and the Nielalroch.