This castle is situated on an important crossing point on the river. For centuries, settlements have sprung up here, taking advantage of the naturally defensive site. This crossing point is the only one for miles around, and as a consequence is a major trade route. You can still make out the remains of the earliest settlement here, the slightly raised areas south of the castle.
The keep has been built on a small island and its separation from the main castle adds further defensiveness.
NB: Please feel free to review this map, as it is my first attempt and submission here.