Piedmont
Piedmont is the second-largest geographical region of Georgia. Rolling hills and valleys mainly comprise the Piedmont. This region comprises a third of the state and holds the largest population. The elevations of the region are quite tall and can range up to 1700 feet.
Oceanic Crust
Continental Crust
Oceanic crust is denser than continental, this is why continents are at higher elevation than oceans.
Im not sure but there is a city in Bulgaria named “Oven”