What continent would you find in Puerto Rico?

Many would consider Puerto Rico and all of the greater Antilles as part of North America.

In reality, with the exception of Cuba which is on the North American tectonic plate, the Caribbean island-chain known as the Greater and Lesser Antilles are on the north and east side of a separate tectonic plate called, appropriately enough, the Caribbean Plate. Puerto Rico is the smallest island of the Greater Antilles. So technically, Puerto Rico cannot be found on any of the seven continents.