The Lowlands

After Vrök's Aquagnomes, other gods quickly fashioned races out of their own favored elements - from ice and snow, Bidge created the Shurm, Thysis forged his Vash'Rajim out of the molten heart of the mountains, and Gao Guang sculpted his earthen Xiaorenwu from the stinging desert sands.


 * - History of the World (Part 1), Jonathan Brooks

After the Sundering, the ground still below the clouds came to be known as the Lowlands. The Shuurm call it Ject, which means 'The World'