A more thorough explanation:

Riparian

Riparian refers to the land that is next to a river or stream.

For example, if you own a house that is next to a river, your property is considered riparian land.

Riparian land is important because it can have an impact on the health of the river or stream. Plants and trees that grow on riparian land can help prevent erosion and filter pollutants before they enter the water. Animals that live on riparian land can also contribute to the health of the river or stream by providing habitat for fish and other aquatic creatures.