X Marks the Spot is an object in the Shipwrecked DLC that appears only after its location has been revealed by reading a Message in a Bottle. It appears as two X-crossed bones over disturbed soil. It can be dug up with a Shovel or shot with a Boat Cannon to reveal Bone Shards and a Chest containing several pieces of treasure. Players should be cautious as one treasure preset spawns 3 Snakes when dug up.
When worn, Woodlegs'Lucky Hat creates a new X Marks the Spot every 800 seconds (slightly more than 1 Day and a half). If worn by a non player character, such as a Wildbore or a Prime Ape, it only has a 66% chance to spawn a treasure.
During a Volcano eruption in Dry Season, if a Dragoon Egg happens to fall on an X Marks the Spot, it will be dug up, burning the Chest and all flammable Items it contained.