The Forest of Endurance in "Dragon Quest 3: HD-2D Remastered Edition" is a special area that can be upgraded in the game. If you want to go to the Forest of Endurance, you can first obtain a ship. You will be able to prepare for Porto King Jia prepares black pepper and obtains a boat. Once you have the boat, you can find the area with metal slimes.
Where is the Forest of Endlessness in Dragon Quest 3 Remake
Once you have acquired the ship and can sail freely, you will encounter several areas where you can find metal slimes.
On the east side of the map, you will find the town of Duration in the center of the northeastern continent, surrounded by the Forest of Duration.
If you roam the surrounding small islands and the woods on the peninsula, you will encounter metal slimes, although they are always very rare.