Yard signs are popping up around Mountain View drawing attention to a contentious state bill that could allow for denser housing in areas near transit stops.
the Peninsula roughly coincides with the borders of San Mateo County, although it also includes the northwestern Santa Clara County cities of Palo Alto, Mountain View, and Los Altos
Mountain View is South Bay.
https://en.wikivoyage.org/wiki/South_Bay
It literally says peninsula in your link.