130 000 13 million 130 million 1.3 million
Baltic Sea Adriatic Sea North Sea Ionian Sea
Austro-Hungarian British Russian Ottoman
Latvia Lithuania Russian Federation Finland
Lake Peipus Lake Ulemiste Lake Viljandi Lake Snadjarv
Narva Paldiski Tallinn Valga
90% 75% 25% 50%
Sweden Soviet Union Great Britain Finland