For several years the Holland River and Lake Simcoe provided the only means of transportation between York (now Toronto) and the upper Great Lakes; Holland Landing was the northern terminus of Yonge Street. The military route to Georgian Bay prior to, and during the War of 1812, crossed Lake Simcoe to the head of Kempenfelt Bay, then by the Nine Mile Portage to Willow Creek and the Nottawasaga River. The Penetanguishene Military Post was started before the war, however, lacking a suitable overland transport route, passage from York to Lake Huron continued via the Nottawasaga. The Penetanguishene Road replaced this route when the Naval Establishment was opened in 1818.