Located near the city of Omashu in the Earth Kingdom, the Cave of Two Lovers, also known as the Secret Tunnel. The "tunnel" is actually a giant underground labyrinth full of dangerous animals, including wolfbats and the gigantic badgermoles. It was also shown to be impossible to map the maze because the badgermoles earthbend the tunnels regularly; this prevents any sort of normal navigation. To find one's way out of the tunnels, they must "trust in love" and relinquish one's dependence on torches and any sort of natural lighting; if one does so, then shining crystals will guide the way.