The Oak Ridges Moraine (ORM) is a prominent ridge of land formed by glacial sediments, including gravel, sand and glacial till. It is one of the largest and most complex glacial remnants in Ontario.

Rising in the Region of Peel and Counties of Dufferin and Simcoe in the west and running in a generally east-west direction for 160 km into Northumberland County, the Moraine forms the drainage divide between Lakes Simcoe and Ontario and acts as the headwaters for over 35 rivers and streams in the Greater Toronto Area (GTA).

The land along the Moraine is valuable for a number of different reasons and has been the subject of much media and citizen interest lately.

The links below highlight various aspects of the Moraine

• Provincial Oak Ridges Moraine Conservation Plan, 2001
• Oak Ridges Moraine Quick Facts
• Formation, Location, Features and Importance of the Moraine
• Regional Protection Initiative
• Regional Official Plan Amendment 41 - The Oak Ridges Moraine Conformity Amendment
• ROPA 41 Background Information