The boundary lines for the sun packs land is the heart lake. They know not to go over half of it for if they do they will get attacked by the Light pack. The Frozen heart boundary is a old boundary that had been there since the packs were fist made. No one has cross the boundary for someone is always attacked and killed by the other pack and then they decided to leave the pack be. There have been a lot of fights near and on the lake and it has yet to brake.