Birch Bay is a protected bay of the east shore of the Salish Sea, between Semiahmoo Bay and Lummi Bay; approximately 100 miles (160 km) north of Seattle and 35 miles (56 km) south of Vancouver, BC, Canada.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/bays/birch-bay/wikipedia/en.wikipedia.org.md
Birch Bay is a headland bay created by the refraction of incoming waves on the headlands that lie on either side of the bay.
