This Encyclopedia is designed to accumulate and systematize our knowledge about the unique natural water areas - the Barents, White and Kara seas, their wealth, the events that took place on its waters and shores, and the remarkable people whose lives were and are closely intertwined with the seas. The Encyclopedia contains about 900 terms and concepts related to the seas. It describes geographical features: rivers, lakes, straits, bays; provides information about towns, seaports, transport communications, basic aquatic biological species, nature reserves, national and international programs...

The book is dedicated to the Ionian Sea, which is part of the Mediterranean. The encyclopedia contains about 600 articles on the hydrographic and geographic objects, hydrological features of the sea, biological resources, as well as administrative-territorial units of the Ionian countries. The most significant natural objects like islands, peninsulas, bays, rivers, mountains, their geographical peculiarities are briefly described as well as economy, culture and history, cities, ports, international agreements, research institutions, activities of outstanding scientists, researchers, travelers...