In Irish mythology, Mag Mell (modern spelling: Magh Meall, meaning 'delightful plain')[1] is one of the names for the Celtic Otherworld, a mythical realm achievable through death and/or glory.
Unlike the underworld in some mythologies, Mag Mell was a pleasurable paradise, identified as either an island far to the west of Ireland or a kingdom beneath the ocean.
Furthermore, Mag Mell, like the numerous other mystical islands said to be off the coast of Ireland, was never explicitly stated in any surviving mythological account to be an afterlife.
Legends say its ruler is the sea god Manannán mac Lir, or less often the Fomorian King Tethra.
In later stories, the realm is less an otherworld destination than an earthly paradise which adventurers could reach by traveling west from Ireland, often blown off course by providential tempests while on an inspired mission.