Castles and Moats: Most Castles Were NOT Surrounded by Water

**Misconception:** "Most castles had moats." **Reality:** Only a **minority** of castles were water-surrounded.

Why Moats Were Rare

• Cost: Digging, lining (clay/puddling), maintaining water level = enormous expense.
• Geology: Requires high water table, impermeable substrate, or reliable stream diversion.
• Engineering: Dams, sluices, feed channels — complex hydrology.
• Climate: Freezing (ice bridges), drought (dry moat = useless), silting.

Where Moats *Did* Exist

• Lowland sites: England (Bodiam, Leeds, Kenilworth), Netherlands, Flanders, N. France, N. Germany — clay soils, high water table.
• Palace-fortresses: More symbolic/status than purely military (e.g., Château de Vaux-le-Vicomte).
• Urban castles: Fed by city canals/rivers (e.g., Tower of London — now dry).

Common Alternatives

• Dry ditches (fosses): Dug ditch, steep sides — cheaper, effective.
• Natural topography: Cliffs, rivers, marshes, hills (e.g., Edinburgh, Stirling, Carcassonne).
• Palasades / stockades: Timber — early/motte-and-bailey.

Moat Functions (When Present)

• Prevent undermining (sapping).
• Keep siege towers/rams at distance.
• Reflect prestige.

**Bottom line:** Moats are a **high-status, lowland specialty**—not the norm. Most castles relied on **height, stone, and dry ditches**.