Belgium is flat
A meadow
it mostly has rocky land
a plateau is an area of mostly high, flat land that is raised above nearby land.
A plateau
Valley
i think its Source
plateu.
plateau
No, Philadelphia is mostly flat land. There aren't many near it either.
planes
About 20% of Japan's land is flat. This is because it is a chain of volcanic islands (like Hawaii) making it mostly mountainous.