'm pretty sure that all countries claim a 12 mile limit....but that the limit between venequela would be 9 miles for the point that there is only 18 miles between then.
So it has to be half way between the land masses??? I can see 12 miles when it's the Atlantic or Pacific Oceans but Aruba and Venezuela are close!!
Maritime claims: territorial sea: 12 nm (nautical miles)
http://www.cia.gov/cia/publications/factbook/print/aa.html