Region, and Hobo is being polite with his phrasing of this as "pretty much" for the region title. No other teams in the region can statistically win the region title at this point.
This is a BIG game for both teams, and great for Region I! To have two teams in the top 5 in the AAAA girls polls is a first!
There's also the little fact of facing the #3 or #4 seed from Region II in the first round, and getting home field advantage at least through the 2nd round. Both programs are having great seasons, and are looking to lay claim to a "slightly" (NOTHING is easy when you face a Region II team in the 1st round) smoother path in the playoffs.