Which body of water, fed by the Bristol Channel, has the second-highest tidal range in the world after the Bay of Fundy?

• A The Wash
• B Solway Firth
• C Severn Estuary ✓
• D Thames Estuary

The Severn Estuary has a spring tidal range exceeding 14 metres at Avonmouth; the extreme funnel shape amplifies the tidal wave, causing the famous Severn Bore.