https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/techtonic-plates/arabian-plate/arabian-plate.md
The northeasterly growth of Semiahmoo Spit indicates that sediment eroded from Birch Point has been transported by littoral drift northward, leading to the growth of the spit.
Arabian Plate (Wikipedia) The Arabian Plate is a minor tectonic plate in the Northern and Eastern Hemispheres.