Why Rivers Were Vital to Castle Builders

Rivers provided six strategic advantages for medieval castle construction:

1. Transportation: Natural highways for moving stone, timber, supplies, and troops; docks enabled trade and communication.
2. Defense: Wide, flowing water hindered attackers; could be enhanced with moats.
3. Water Supply: Reliable fresh water for drinking, cooking, sanitation—critical during sieges.
4. Power Source: Watermills ground grain, powered workshops, enabled self-sufficiency.
5. Food: Fish provided protein, especially during blockades.
6. Trade & Commerce: River access linked the castle to markets, generating wealth and alliances.

A riverside site was a force multiplier for security, sustainability, and prosperity.