It can be said that within the ten-thousand-mile range of the Sea Eye, every moment is filled with vast numbers of ghostly creatures and Sea Demons breaking in.
To avoid forming a tide of ghosts and to prevent the emergence of unimaginably powerful ghostly beings,
it has become an unspoken rule among Human Clan Cultivators to periodically eradicate the strong ghosts and Sea Demons within these ten thousand miles.
The phrase "territory" refers to the area each Golden Core Main Priest is responsible for purging, with larger ones spanning a thousand miles and smaller ones about a hundred miles, depending on the richness and quality of the Heavenly Materials and Earthly Treasures and cultivation resources within.
Once a territory is chosen, all the Heavenly Materials and Earthly Treasures and cultivation resources produced within it are deemed to belong to the designated individual by default.
Of course, that's provided you can keep hold of it.