"...there is much else that may be told." — Glóin|
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Martalmar, known also as the Earthroots or Talmar Ambaren, were the foundations of the earth in the Hidden Half of Arda far beneath the edge of the world.
J.R.R. Tolkien, Christopher Tolkien (ed.), The Shaping of Middle-earth, "V. The Ambarkanta" pp. 235-261