mythic boundary markers

Brainstorming time!

I’d like you all to tell me what objects you might, from a mythical standpoint, associate with the delineation of boundaries and borders. I’m looking specifically for objects that might be a personal possession; walls and fences are obvious boundary markers, as are rivers, but neither are really the sort of thing a person could carry around with them. A sword, on the other hand, being a thing that cuts, could be the thing that marks the division between Here and Not Here, whether by literally drawing a line in the dirt or just symbolically cleaving things apart.

Can you think of/make an argument for other personal-sized objects that might represent geographical boundaries?

Originally published at Swan Tower. You can comment here or there.