Europe’s lowlands

Europe contains extensive lowland plains: most of the Great European Plain lies below 152 m above sea level. However, I could not find a reliable source confirming the specific estimate that 60% of Europe’s entire surface is below 200 m; it should be treated as an unverified approximation. Some North Sea and Baltic coastal land lies below sea level. The Caspian Sea, a landlocked water body classified both as a sea and as a lake, stands about 28 m below global ocean level [1–3].