The Reach is the largest region except for the North, it encompasses a region of the most fertile part of Westeros and numerous well-populated villages and towns.
It is ruled by House Tyrell from Highgarden. The Tyrells were stewards to House Gardener, the Kings of the Reach before Aegon's conquest. After the last Gardener king was killed on the Field of Fire, the Tyrells surrendered Highgarden to Aegon and were rewarded with both the castle and the position of overlords of the Reach. Bannermen of the Tyrells frequently fight with the Dornishmen of the south. The borderlands between the two regions, called the Dornish Marches, are populated on the north side by marcher lords loyal to the Tyrells. The most prominent city in the Reach is Oldtown. It is the oldest city in Westeros, home to the maesters' Citadel, and the previous seat of the Faith. Bastards in the Reach are given the surname Flowers.