Forming the "useless coast" -- i.e. no shipping allowed

How would you form an extended stretch of coastline that is effectively useless for overwater trade -- i.e. there are no sheltered areas to serve as ports, or trade routes that can reach all the way to the shore to allow ships to trade? It seems that a coast with cliffs would be an important element of this, but what would prevent paths up and down the cliff forming, or the cliff being divided into segments (say, by estuaries) for that matter?

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Forming the "useless coast" -- i.e. no shipping allowed

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