Sun's Reach is the staging area for the Shattered Sun Offensive on the Isle of Quel'Danas. They battle against Kael'thas Sunstrider and his legions, such as the Dawnblade, the Wretched and the demons of the Burning Legion.
There are currently only two specific travel paths to get to Sun's Reach by either Gryphon or Wyvern. However, players can take either the Alliance or Horde portals from the city of Shattrath, they can be summoned by another player or set their hearth to the inn here and hearth back should they so choose. In addition, one of the quests grants a scroll to allow the player to teleport directly to Shattrath, even if their hearthstone is on cooldown.