Related Clues:
- Hoover and Mossyrock
- Mica and Tobin
- They keep unfriendly fans off the pitch in South America
- Watery castle ditches
- Zoo security features
- Challenges for salmon
- Castle ditches
- Water defences
- Prevents from running, in a way
- Atoms smashed in defensive ditches
- Fish ladder locales
- Castle defenses
- They supply hydroelectric power
- Beavers' handiwork
- Hydropower structures