Oak Ridges Moraine

An irreplaceable resource for Ontarians.

A key natural heritage system due to its hydrological significance, the Oak Ridges Moraine was formed over 12,000 years ago by advancing and retreating glaciers. The Oak Ridges Moraine currently forms the watershed divide between Lake Ontario and Lake Simcoe and is the headwaters to more than 30 rivers. The aquifer (underground lake) located below the Moraine contributes to both local and regional groundwater flows, making it a vital asset for Ontarians. In fact, 7 million Ontarians depend on the Oak Ridges Moraine for clean water.

Beyond being both a natural and essential resource for groundwater flows, the Moraine is also home to a variety of diverse vegetation and wildlife species. In fact, the Moraine is home to over 1,000 plant species, 30 species of reptiles and amphibians, 51 mammal species; 73 fish species; 74 species of butterfly, 125 species of moss, and 88 provincially or nationally protected species-at-risk! 

Also part of the Oak Ridges Moraine is Holland Marsh, which is referred to as ‘Ontario’s Vegetable Basket’ because it produces not only a large volume of fresh vegetables for Ontarians to eat, but a wide variety of them as well. 

The Oak Ridges Moraine is jointly stewarded and protected by its 32 municipalities, 9 conservation authorities, and 40 non-governmental environmental organizations

Explore the Oak Ridges Moraine today!