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I used to sell store locator software and this is always a problem. We worked on allowing “masks” over water that basically added a penalty for any vector that passed over the mask. It’s a hard problem at any kind of scale though and even this solution wasn’t perfect (imagine a river with no bridges or ferries only)

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The correct solution is to use an isochrone rather than a basic radius search. Or to simply sort all the shores within the max search radius using a vehicle routing library/api.

That doesn’t work at scale unless you have an api with unlimited request throughput or knowledge of where water is (again needing access to the raw map or unlimited api access). In this case, the stores had to mark their own masks on the map.

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