Jewel Ice Sheet

The Jewel Ice Sheet is a treasure cache frozen beneath very hard ice somewhere in the New World.

Geography
The ice sheet is very large with dozens of huge icicles jutting out from it. The ice itself is almost impossible to break. Beneath the ice is a cave full of treasure, amassed over centuries.

History
Thirty years ago, Chinjao broke through the ice with his head, gaining access to the vast riches that lay beneath. He vowed to never let anyone near this treasure, which had been collected by people in his family.

Sometime later, after losing his drill-shaped head in a battle against Vice Admiral Garp, Chinjao returned to the island and tried to break the ice again, but could not. He then cursed Garp and his family for costing him his access to the treasure.