This picture explains swimming zone, this is an area where people can swim and other part is dangerous because of ships, scooters and all fun on water and sure it is irregular for swimming because of sharks:)
Thales was born in what's now Turkey, in the city of Miletus, about 630 BC, during the Archaic period. He understood that the earth was round, and that the moon was lit by light reflecting from the sun. According to Herodotus, in 585 BC Thales was the first person to successfully predict an eclipse of the sun (an eclipse which ended a war between the Lydians and the Persians).
The sea rogue waves are a phenomenon that you do not know the causes or origin. High tidal waves were observed from 25 to 30 meters, which seem to occur unpredictably. Among these there are storm surges, tsunamis that are generated by a movement of the earth's crust under the sea.They amplify and manifest coming closer to the coast.