How to add new space to build on in Dragons of Atlantis?

Question

I thought I'd try out Dragons of Atlantis on Google Plus, one of the quests requires me to build three of each resource buildings, but I'm short on one patch of land:

So I'm wondering: how do I add a patch of land to build on? Or do I automatically get this once I reach a higher level?

Answer

I just read the description of upgrading my Fortress to Level 4 and it says: Occupy 3 Wildernesses, accept 3 Reinforcement Marches and open 3 more Resource Sites.

So upgrading my Fortress did the trick:

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