The heart of the site, as currently understood, is a series of oval or roughly circular enclosures.

The most extensively excavated of these, designated by letters in the archaeological record, are Enclosures A, B, C, and D, all located in what excavators call Layer III — the oldest and deepest occupation layer at the site, dating broadly to the period around 9,600 to 8,800 BCE.

Each enclosure follows a similar general plan, though with variations in size, orientation, and specific details.

The perimeter of each enclosure is formed by stone benches and walls, with T-shaped limestone pillars set into the walls at intervals around the interior.