The Appenine Mountians, this answer is coming straight from my Social Studies text book :P
Rocky mountain
the latium plain is the richest plain in the ancient itlay. it located in the rome.
Tuscan Plain ~ north central Italy. Latium Plain ~ middle of the west coast of Italy. Campanian Plain ~ southwest coast of Italy.
The Manchurian Plain marks the northeastern part and the North China Plain marks the east and southeast border.
Tiber River in Rome, Italy.
Mountain
Latins settled by the Tiber River in west-central Italy on the plain of Latium.
The Aventine Hill in Rome has an elevation of approximately 40 meters (130 feet), while the Latium Plain is relatively flat with an average elevation of around 100 meters (330 feet). Therefore, the approximate elevation difference between the Aventine Hill and the Latium Plain is about 60 meters (200 feet).
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The Russian Plain is the largest area that is mountain free in Europe. It ranges from eastern Poland to the Ural Mountains and includes all of the Balkan countries.
Its the Danube river and Danube plain separates Romania and Bulgaria. There are no mountaneous border between the mentioned two countries. And Carpathian mountain range of Romnia or Balkan mountain range (most northern mountains of Bulgaria: none of them serves as border.
YES