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Seas and oceans cover roughly 72% of the Earth's surface, roughly 70% of the world's population lives on their coasts, and about 90% of the world's foreign trade is carried out on maritime routes. What do we not know about the sea dimension? What should we know? And why can't we ignore it? PhDr. Michael Romancov, PhD. (1969). Graduate of the Faculty of Education of the Charles University and the Faculty of Social Sciences of the Charles University. He works at the Institute of Political Studies of the FSV of the UK and at the Metropolitan University of Prague. He specializes in political geography, geopolitics and Russia.