The Regional Municipality of York, also called York Region, is a regional municipality in southern Ontario, Canada, situated between the southern shores of Lake Simcoe and the northern boundary of the City of Toronto. It replaced the former York County in 1971.
York Region covers 1,776 square kilometres from Lake Simcoe in the north to the city of Toronto in the south. Its eastern border is shared with Durham Region, to the west is Peel Region, and Simcoe County is to the northwest.
It is the brand name for the York Region Rapid Transit Plan, and was funded through a Public-Private Partnership (P3) consortium called the York Region Rapid Transit Corporation. York Region has control over all fares and service planning. Viva service is integrated with York Region Transit's conventional transit service and operated as one regional transit system (1system) that enables customers to travel across the Region.
Viva began operations on September 4, 2005 at 9 am EST, and officially opened on September 6, 2005. The second phase was opened on October 16, 2005, the third phase was opened on November 20, 2005, and the first part of the fourth phase was opened on January 2, 2006 (the Cornell extension is the second part of Phase 4).