Starting from 500 AD to 750 AD, these hunter-gatherers started to colonize the savannah-forest ecosystem of Esanland and the forest ecosystem of the Benin Empire. They created a pre-Esan, pre-Edo society that built advanced structures such as moats and walls around family properties. These enclosures were, at maximum, three to five kilometers in diameter, and demarcated residential and agricultural property. Those properties enlarged to become villages, and by 800 AD, these village coalesced to form kingdoms with hierarchies. Modern-day digs in the region have found that these walls were situated in the eastern Benin Empire and northern Esanland. Settlements were close to permanent springs on the northern plateau, but never next to intermittent springs.