Thanks, Timothy. We had recently had a pretty good rain event in the area and the small stream that created this pattern was flowing all the way into the ocean. Normally it's just a dry crack on the beach.
Patterns formed at the edge of a small stream flowing into the surf at The Sea Ranch, CA. R5, RF 24-105 f/4, @ 40 mm, View attachment 1231/60th, f/16, iso 100