This page lists a number of unique features you can see or visit in the game.
This is the pirate village indicated by the blue double arrow marker on the top "compass" indicator line.
This is the pirate village indicated by the red double arrow marker on the top "compass" indicator line.
Waterfall Pirate Base
This item is possibly in an area which is not intended for players to reach. It involves going around one of the invisible walls in the game. But if you take a lower road, going to the left on the left side of the Giant Head, you can get around and find this base. It has three chests and two bowls of Meat Stew which regularly respawn.
Lake of Two Rivers
(Name borrowed from the lake of the same name in Algonquin Park, Ontario, Canada.) This lake is fed from two rivers and sits between a mountain face and a rock face. This is considered deep water for fishing.