An odd shaped feature, like an amphitheater. On the left is a circle with about 9 arcs radiating out from it.
Here are some odd features outlined. First, superimposing ellipses shows the arcs are similar to parts of ellipses. You should be able to see the edges of the ellipses follow the edges of the features. This is not accurately worked out, but it indicates the shapes are consistent with the theory of a solar system model.