How many areas bordered by water?

The number of areas bordered by water can refer to various geographic features, including continents, islands, and coastal regions. Generally, the Earth has five major oceans—Atlantic, Pacific, Indian, Southern, and Arctic—along with numerous seas, lakes, and rivers that create various areas of land bordered by water. If you mean specific regions or countries, there are many, as nearly all continents have Coastlines. For a precise number, clarification on the type of areas you are referring to would be needed.