A coastal river is a waterway that flows into an ocean or sea, often characterized by its estuarine environment. These rivers typically have a mix of freshwater from inland sources and saltwater from the ocean, creating unique ecosystems that support diverse plant and animal life. Coastal rivers play a crucial role in shaping the landscape, providing habitats for wildlife, and serving as important resources for human activities such as fishing and recreation. They are often influenced by tides, which can affect their flow and sediment transport, making them dynamic and vital components of coastal geography.