The only country that I can think of that fits the description is the Austro-Hungarian Empire. Just before the war ended, the empire split into several smaller countries. Austria and Hungary became independent countries, and also became landlocked. Before its dissolution, the Empire had controlled the territory that is now Croatia and Bosnia, which gave it access to the sea.
russia
Every country lost: there is no winner in a war. A couple lost more than the others; Russia and Germany were quite heavily damaged by the war and its aftermath.
The Russian Empire
Luxembourg lost the least troops during the First World War.
The German, they were the leaders of Spain etc. and when they lost to many men they lost!
Austro-hungary
It lost access to Marble sea and Adriatic at Balkan wars. No change after WW1
tomboy
No, it lost access after World War I. Prior to World War I, Bulgaria included what is now the Greek province of Western Thrace and therefore had an outlet on the Aegean Sea (which is considered an arm of the Mediterranean). However, since the Treaty of Neuilly in 1919, Western Thrace belongs to Greece, cutting Bulgaria off to the Mediterranean.
The Kingdom of Judah lost some or most of its easy access to the Mediterranean and to the north of Israel. The other Kingdom, Israel (Ten Tribes) retained these areas. See also:Jewish history timeline
Zimbabwe lost maximum matches(33) in world cup.
The cast of Lost Ships of the Mediterranean - 1999 includes: Robert Cait as Narrator
Germany
Ukraine
The only country in the world that has never lost a war is Canada.
Spain lost the War and its New World Empire.
The U.S lost the least land