When is a rock?

The tiny (110 acre) outpost of Itu Aba in the Spratly archipelago of the South China Sea is claimed by Taiwan to be an island; the Philippines claim it’s a rock. Island status comes with a 200 mile exclusion zone but, if a rock, only 12 miles. Or is it just a ‘low tide elevation’ (0 miles)? Man’s genius for finding ways to disagree surpasses all other creatures. Reuters link, https://t.co/ZI2Lg3H55L