The shoreline of much of the island of Malta is rather rocky, so it could be difficult or even dangerous to go swimming in many places. However, the shore of the urban area of Sliema (which is located just northwest of the nation’s capital, Valletta) features a series of pools cut into the rock with narrow channels or underwater channels connecting the pools to the sea. Most of these pools are square in shape and are only a couple of meters wide, but some are a bit larger or have…