Myrsonas Estuary of is one of Ikaria’s largest rivers and Archipelagos is currently conducting studies into the biodiversity of it's flora and fauna. Like all Ikarian rivers, Myrsonas has a very characteristic water regime, highly dependant on rainfalls, and as a consequence these streams only reach the sea from the end of autumn to the beginning of summer. During the winter months the eels (Anguilla anguilla) that have spent from 6 to 20 years in the stream, swim to the sea and, lead by a strong instinct, migrate back to the Sargasso Sea (in the Atlantic Ocean, east of the USA) where they breed.