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It's about 600 m on foot, so it's not that far away. You have to cross the border not by sea, but by the road. It might be possible, but is not worth the risk.
If you are going to do this, do not cross the border by going through the small dirt road that is a continuation of Str. Falezei. When you get to the point where there are no more houses, there are feral dogs that will charge at you as soon as you turn the up-coming corner.