The Sunken Causeway
A paved road runs across open water, island to island, with one span fallen in. Spurs lead off it to the islands north and south, and the Sunken Stone stands on the northern one, reachable only at low tide.
The Fenmother surfaces here on a forty-five minute timer, and everyone on the road finds out at the same moment.

The Sunken Stone. Half drowned, and there's a cavity in it the size of a barrel where something was cut out.











