Ward 12 extends into the west Flamborough rural area.
Bordered by the former Town of Dundas and Highway 8 on the north, municipal boundary to the west, Sawmill Road (the city limits) on the south and Glanbrook Road to the east.
Home to Redeemer University College, as well as part of the Dundas Valley Conservation Area. There are several small to medium commercial and light industrial sections, including the Meadowlands Power Centre and the Ancaster Business Park. It is also home to several rural settlements including Copetown, Sheffield, Lynden and Jerseyville.
Ward 12 is located mainly within the Hamilton and Grand River Conservation Authorities watershed, with some Niagara Region to the east.