If it is... it should be at one end of the trail or the other. I didn't see any landmarks along the way that seemed like a likely focus.

[Ayakashi... sound like and unlike the Dead and Free magic entities. So Sabriel nods thoughtfully, trying to fit together what he's told her with her experiences in this world and her own. But an ally- one experienced in the supernatural especially- would be helpful in finding her way off this island.]

I'm a Charter mage of some skill, as well as a necromancer- but I do not raise the Dead, only lay them to rest.