The Vale is one of the seven great kingdoms of Westeros, a mountainous jut of terrain demarcated by the Mountains of the Moon to the west and surrounded on the other three sides by water. The people of The Vale are fairly insular, which is unsurprising given the difficulty in crossing the mountains that cover most of the kingdom, and the Lords of the Vale are constantly fighting to hold their lands against constant incursions from the Mountain Clans, barbarian tribes that have no use for Lords or kingdoms.
More recently The Vale has had to contend with a new incursion; that of iron-wielding religious fanatics from Andalos. Luckily for the Lords of the Vale, the Mountain Clansmen love the Andals even less than the Valemen, and for now they are holding back the tide for the most part.
The king of The Vale is known as the Bronze King, and is currrently King Corwyn Royce.