Green lands

"We'll spread our dominion across the Green lands, securing the Neck and everything above."

- Balon Greyjoy

Green lands is a term employed by the ironborn to refer to the mainland of Westeros.

In the books
In the A Song of Ice and Fire novels, the term gives an insight on how the ironborn view the mainland of Westeros, fertile fields with soft, weak people, unlike the Iron Isles, harsh, poor land that has bred hardy and fierce men.