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You can also accomplish this with Flash and get a bit more sophistication into the interface, irregular boundaries and such - but that's not just HTML.
It you're looking for a third-party service you can just purchase - I'd suggest a Google search. I saw a few potential results that might be worth checking out.
But now I'm thinking you may want to show a precise map for each and every property you list, right on that property's page or possible linked from it.
To help us give good feedback, can yuou provide a bit more detail about your needs and what you envision?
And I could go with the idea of just presenting a map of the whole region of the Costa we are specialising in, then divide it up and allow segments of that area to be clicked - which in turn would list the relevant property from that selected area like you suggest. How could you simply do that though. If for example you clicked segment A on the map - how do I then list relevant property references 1,6,7,9,15 for example- by pulling them out of the list and presenting them on a separate page?
To be honest, I am up for ideas. I really have not decided exactly the best way to use a mapping service yet.
[w3schools.com...]
There's a working example, and toward the bottom a link to a demo page where you can try changing the code and see the results.