The "Bonilla-Tatoosh Line" is defined as a line projected from the most westerly point on Cape Flattery (48°22.863' N. lat., 124°43.907' W. long.) to the lighthouse on Tatoosh Island, WA (48°23.493' N. lat., 124°44.207' W. long.) then to the light on Bonilla Point on Vancouver Island, British Columbia (48°35.73' N. lat., 124°43.00' W. long.).
Wash. Admin. Code § 220-300-360