The Oro Moraine is a glacial moraine in Simcoe County, Ontario, Canada. The moraine covers 141 square kilometres (54 sq mi) north of Barrie, Ontario. The moraine drains into Georgian Bay on Lake Huron, and the smaller Lake Simcoe.
Water transporting layers within the moraine, composed of sand and gravel, are separated by relatively impervious aquitard layers composed of or silt or clay.
Efforts are being made to preserve undeveloped land on the moraine, and to encourage land owners to leave their property as a legacy to the regional conservation authorities in their wills.
- "Oro Morain 2010 Report Card" (in English). Lake Simcoe Region Conservation Authority. 2010. Archived from the original on 2012-11-26. Retrieved 2012-11-26. "The Oro Moraine is a prominent natural landform extending northeast from Highway 400 to Orillia. The vast majority of the Moraine lies within Oro-Medonte Township. The west and east tips of the Moraine extends into Springwater Township and the City of Orillia, respectively. The Oro Moraine is approximately 21 km long by 6 km wide and covers an area about 141 square kilometers."
- J. Beckers, E.O. Frind (2000-11-08). "Simulating groundwater flow and runoff for the Oro Moraine aquifer system." (in English). Journal of Hydrology. Retrieved 2012-11-26.
- "The Oro Moraine" (in English). Counchiching Conservancy. 2012. Archived from the original on 2012-11-26. Retrieved 2012-11-26.
- Ryan Post (2007-07-18). "Conservation Corner: Groundwater, the hidden resource" (in English). Innisfil Scope. Archived from the original on 2012-11-26. Retrieved 2012-11-. "Recharge areas in the NVCA are generally located in areas of elevated topography with permeable sand and gravel layers. Major recharge areas include Oro Moraine, the Simcoe Uplands, Oak Ridges Moraine, and portions of the Niagara Escarpment in areas where ice-contact glacial deposits and morainal areas are present."
- "Willow Creek Subwatershed Plan" (in English). Nottawasage Valley Conservation Authority. 2001-12. Archived from the original on 2012-11-26. Retrieved 2012-11-26.
- "Land and Water Stewardship: New Funds for Fish Habitat" (in English). Nottawasaga News. 2008-07. Archived from the original on 2012-11-26. Retrieved 2012-11-26.
- "Severn Sound Headwaters 2007 Report Card" (PDF) (in English). Nottawasaga Valley Conservation Authority. Archived from the original on 2012-11-26. Retrieved 2011-03-02. "Spring-fed tributaries of the Sturgeon River emerge along a valley running between the base of the Simcoe Uplands and the west edge of the Oro Moraine near Hillsdale."