Very interesting. If this map is true, boundry between sabre springs & Miramar Ranch N. is Scripps poway pkway. That means that a few streets south of the canyon & north of Scripps-poway pkwy (e.g. ivy hill Dr., Village Ridge Rd. etc.) belong to Sabre springs.
I bet most residents on those streets think that they live in “Scripps Ranch”! (And a huge majority living in Miramar Ranch N. probably does not know what Miramar Ranch N. is!)