"Middle-earth", also known as Endor in Quenya (Ennor in Sindarin), and in The Book of Lost Tales the Great Lands, are names used for the habitable parts of Arda after the final ruin of Beleriand, east across the Belegaer from Aman. This continent was north of the Hither Lands shown in the Ambarkanta, and west of the Eastern Sea; and from the beginning of Arda to the end of the Second Age it underwent dramatic geographical changes, caused by Eru Ilúvatar, the Valar and Melkor.