Luke's Reef is a large coral reef in the Eastern Sea. Luke's Reef is unexplored, but is apparently composed mainly of a very spiky species of coral. The reef is entirely submerged beneath the water, and is apparently low enough that even a large ship can pass over it without damage; this can be seen in that the zombie pirate ship The Inebriated passed over it without any negative side effects. The reef is named so because it was discovered by 50% Luke when he fell from The Inebriated. It is not far from a similar reef, The Other 50% Reef, where Luke lost nearly half of his body.