You can get the data you need from here

http://www.soest.hawaii.edu/wessel/gshhs/gshhs.html

It even has ponds in islands on lakes ...

A server side app that georefed a point to sea / land could be built
with this.

Trouble is its a bit CPU intensive especisally when it comes to the
enormous Eurasia polygon.
I could be that preprocessing to booleans for say 1km squares would be
the thing to do with it.


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