The term Salish Sea is quite new, dating officially from 2010 when both Canadian and American geographical boards adopted the name. The sea comprises of the Strait of Gerogia, Pugeot Sound and Strait of Juan de Fuca. Think of it this way, imagine if the Mediterranean Sea was only known as a group of a dozen seas (Aegean, Ionian, Adriatic, Tyrrhenian, Cilician, Libyan, Crete, Ligurian, Belearic, Alboran Seas, etc.) but had no unifying name. Well that's the case with the Salish Sea. A combination of a national border and somewhat unique geography likely prevented a unified name. Thanks to geographic societies and professionals we now have a unified name. Quick question: Is the Johnstone Strait part of the Salish Sea? Should it be included?
I think not. None of the maps I've seen show the Salish Sea going past the northern end of the Strait of Georgia.