What glacial landform is responsible for a large portion of the water resources for greater metropolitan Toronto?

Question

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The Oak Ridges moraine is a glacial landform that stretches from the Niagara Escarpment to the Trent River watershed. It is composed of alternating layers of sand, silt, and clay deposited by the last ice age. The moraine acts as a natural aquifer, storing rainwater and releasing it slowly into surrounding streams and rivers, making it a vital source of water resources for the greater metropolitan Toronto area. The channel fills of coarse glacial outwash within the Oak Ridges Moraine also contribute to the region's water resources. Therefore, the Oak Ridges moraine and its channel fills of coarse glacial outwash are responsible for a large portion of the water resources for greater metropolitan Toronto.

What Glacial Landform Is Responsible for a Large Portion of the Water