The rocky trail on Plaza Sur starts at the waterline and moves up hill. This sloping terrain warrants a rating of moderately difficult. What you are traversing is the result of a dramatic uplift of the seabed or oceanic crust. North Plaza Island has a nearly identical topography. You can see Plaza Sur’s sibling across the channel (partially visible on the left) from this elevation. These islets were formed about two million years ago during the same event. The cause was non-volcanic. It probably occurred during a clash of tectonic plates.