Here we're talking about the actual area of control, not merely that the Giant Bone Domain and Dragon Bone Domain combined are so large.
In fact, a single Giant Bone Domain alone is more than that.
After all, Gaven's method of control differs significantly from the Advanced Undead Lords like the Giant Bone King.
The Giant Bone King and the others are at best occupying, leaving everywhere like a colander full of holes. Even slightly stronger beings can secretly occupy the Soul Pool, let alone people like Gaven, who possess the corresponding Divine Nature Force.
Low-level Undead Lords engaging in battles with each other to seize Soul Pools is commonplace, neither managed nor managed well.
However, Gaven is different. He can have absolute control over his occupied areas, making everything there act according to his will.
