At a very low tide at Boundary Bay, you can walk out over the sand flats for perhaps about a mile before you come to the surf. All the way out you alternately cross dry or drying pans, and long, shallow pools oriented roughly parallel to the shore.
is walking across a broad field of long-wavelength ripples, shown here extending from the shoreline to the giant yellow push-pin. That's about as far out as I have ever walked. The brown/blue switch in water colour is an artifact of the composite satellite imagery. The yellow horizontal line is the border separating Tsawwassen, BC and Pt. Roberts, WA.
As the tide recedes, the water flows southward and eastward, in some pinch-points quite powerfully, through the channels between the megaripples. Perhaps metaripples?