East to West - Oostende to Koksijde
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Bray-Dunes - Nieuwpoort. This video shows a skilled sea kayaker. The conditions and shore break are not for beginner surfskiers, but a skilled surfskier with good preparation and safety support would love such a downwinder. Northseakayak posted 3 versions of this video on his youtube channel, maybe your favorite depends on which music you like better?
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Paddling clubs, whether they have surfskis or not, can recommend places to paddle. And sometimes you will find club members who also have surfskis.