The boundaries are captured from legal deeds by creating buffered polygons representing the stretch of rights along the riverbank. Where the agreement extent is one bank on any part of the riverbank the rights extend to the medium filum of the river. Where the agreement extent is both banks on any part of the riverbank the rights extend for the full width of the river. The boundaries are a reflection of what has been signed in the legal documents. The data is in British National Grid.To find out more about Crown Estate Scotland's function, purpose, and values visit our website.