At the end of the final battle, when Sousuke and the Arbalest's AI are discussing the reason for their victory, a shot of Sousuke tapping on a display screen with his knuckles is shown. On that screen, in the upper right corner, is the latitude and longitude values of "022:18:350" and "114:15:206". These values, as North and East latitude/longitude respectively, correspond to an actual street intersection in mainland Hong Kong, where this particular story arc is 'set'.
According to the latitude and longitude displayed on the Arbalest's screen, the final battle takes place at N022°18'35" E114°15'20" - which corresponds to the middle of the intersection of Tong Ming Street and Po Shun Road, in the eastern part of mainland Hong Kong (where the story is actually set).