My second play through I decided to be focused. Everything was going good up until Iron. I found a really big swamp and decided I would build just outside of the swamp next to the ocean. I spent the next week building up my base, it's defenses, a boat and dock. After all that work, there were only two dungeons in the swamp, lol. One was normal iron yield but the other was sparse. All that work for nothing, lol.