Where, on the island, do huck and jim hide their belongings?

The correct answer is a Cave

They found a cave on a high bluff where they decided to hide their belongings and hide Jim as well because if people saw him they could arrest him and take him back to the place where he came from since nobody would believe that Jim was Huck's slave since Huck was a kid. Jim could hide in the cave while Huck would explore the surroundings.