Happy Cascadia Day! The Salish Sea Bioregion is nested within the larger Cascadia Bioregion. Cascadia Day is a good day to think about better ways to imagine the regions we humans name, manage, care for, protect, relate to, and love. It’s not hard think up better systems than the arbitrary political boundaries we typically use. Bioregions, with boundaries based on physical landscape features or ecological systems, are often delineated using watersheds. This map shows the Cascadia Bioregion’s location relative to major North American watersheds.