SeaClan and ThornClan border

The Secret Tunnel that marks the border between the two bickering Clans is made up of the Peninsula in SeaClan's territory and the river from ThornClan. Not many are able to navigate the labyrinth of tunnels and caverns to find their way completely through, but it’s believed a pair of cross Clan lovers—one from each clan—set markers to help them find their way. The tunnels are fairly dry and dark, but occasional shafts (impossible to find from above ground) let thin rays of light through. It’s uncommon to find prey in this deep… unless you have an appetite for worms, spiders or beetles. Cave-ins have never occurred but it isn’t out of the question. The actual border marking the ends of each tunnel is a bundle of rocks with a thin, tall entranceway into the other Clan's territory, but ever since a ThornClan cat killed a SeaClanner when he lost his way and ended up escaping the tunnels onto ThornClan's side, no cat dares cross through the rocky exits.