South coast South Cornwall Ebb
Fowey to Polperro: a china clay harbour, a drowned valley and a harbour that dries
South Cornwall's coast here is a series of deep, wooded river valleys that flood at high water and become mud at low, joined by high cliffs of dark slate. Fowey and Polperro are two of the best harbours in the West Country and the 7.6 nm between them is one of the most satisfying short paddles in England.
- Distance
- 7.6 nm
- Tide window
- 3.4-5.0 m springs, 1.8-2.7 m neaps
- Wind limit
- 12 kt
- Grade
- Intermediate
- Published
- 25 Sept 2026
Fowey and the clay trade
Fowey is a working port, not a marina. It ships china clay, and the harbour is used by vessels up to 100 m which come alongside at the jetties above the town. The channel is narrow, buoyed, and there is a genuine risk of being in the wrong place when one of them moves; keep to the western side of the channel outbound and cross the fairway at right angles.
The river above the town goes 5 nm inland to Lostwithiel and is one of the most sheltered paddles in Cornwall, with wooded banks, a ruined castle at St Winnow and almost no swell. On a day when the coast is too rough it is the natural alternative and it needs no tide planning beyond the two hours either side of high water.
The cliffs west to Polperro
West of the harbour entrance the coast becomes high slate cliffs with deep water close in, which is a great advantage: you can paddle within 30 m of the cliff base in most conditions and there is no beach to land on, but also no shallow shoal to break the swell. The section between Fowey and Polperro has very few landing places, and the two that exist — Polkerris and Lansallos — are both small coves that need settled weather.
The cliffs also produce clapotis in any southwest swell over 1 m, and this stretch is directly exposed to the Atlantic. The reflected waves here arrive off a vertical face and are stronger than the incoming swell in places. Keep 50 m off the cliff when the swell is running and accept the extra distance.
Polperro and the drying harbour
Polperro is a harbour that dries completely, with a narrow entrance between two stone piers that is usable from two hours before to two hours after high water. Outside that window the entrance has a bar that breaks, and there is no room to manoeuvre inside. This is the defining constraint on the day: whatever else happens, you enter Polperro between those hours or you do not enter at all.
Inside, the harbour is a small tidal pool with a beach and a village that is genuinely worth an hour. There is a public toilet, a couple of pubs and a fresh water tap on the quay. At low water the harbour is a mud basin with boats sitting on it, which is a sight in itself.
The tide plan that works
The clean pattern is: launch at Fowey two hours before high water, ride the flood west, enter Polperro at high water, take two hours ashore, and leave on the first of the ebb to be back at Fowey within three hours. That gives you a favourable stream in both directions and it puts the harbour entrance at exactly the right state of tide at both ends of the day.
The plan that fails is the one where the group leaves Polperro late, misses the ebb, and has to fight a flooding stream back east for four miles in the afternoon wind. Plenty of groups have ended up walking into Fowey at ten in the evening after that mistake; the harbour's own boatmen will tell you it is a weekly occurrence in summer.
Plan table
Before departure
- 01
Confirm the Polperro entrance window
Two hours either side of high water; outside that the bar breaks and there is no room inside.
- 02
Check the Fowey shipping movements
Clay vessels up to 100 m use the harbour and the channel is narrow.
- 03
Check the southwest swell
Anything over 1 m makes the cliff section between the two harbours hard work.
- 04
Buy the harbour dues or check whether they apply
Both harbours charge in season; the money goes to the harbour authority, not to a marina.
En route
- 01
Keep west of the fairway leaving Fowey and cross at right angles
This is a working commercial channel with limited visibility round the bends.
- 02
Hold 50 m off the cliffs when swell is running
The slate faces reflect rather than absorb, and the clapotis is stronger than the swell.
- 03
Enter Polperro only within the high water window
The entrance bar breaks outside it and the inner harbour is too small to wait in.
- 04
Leave Polperro on the first of the ebb, not the last
The ebb runs west, which is the direction you want; the flood runs against you.
Key numbers
- 7.6 nm one way, 3 to 4 hours with lunch ashore.
- Polperro entrance is usable only within two hours of high water.
- Wind limit 12 kt; swell is the real gate on the cliff section.
- Very few landing places between the two harbours: Polkerris and Lansallos only.
- Plan to come back on the ebb or accept a stay overnight at Polperro.
Bail-outs
- B1 Polkerris beach, 1.5 nm west, a small sandy cove with a harbour wall
- B2 Polperro harbour, which dries at low water and has a narrow entrance
Return leg：Return west on the last of the ebb to be back at Fowey before the flood turns, or stay in Polperro and go back on the next ebb.