Helcar

The Sea of Helcar was a large Inland sea that was created by the fall of the great Pillar (or Mountain) Helcar, covering the greatest part of Central Middle-earth in the Elder days.By the mid Third Age it had dwindled and reduced to a collection of smaller Lakelands, westernmost of them being the Rhûnaer and the Núrnen, easternmost beinf the Helkanen.