Ontario is home to many significant rivers, including the Ottawa River, which serves as a natural border between Ontario and Quebec. This river is vital for transportation and recreation, flowing into the St. Lawrence River and eventually the Atlantic Ocean. Another important river is the Nipissing River, which connects Lake Nipissing to the Ottawa River. It is known for its scenic beauty and supports various wildlife. The Grand River is also notable, flowing through southwestern Ontario and providing essential water resources for communities along its banks.