Both, depending on your location
hilly
Flat
Belgium is flat
No, Liverpool is quite hilly. The flat land near the Mersey is backed by a large sandstone ridge.
it is called a terrain
hilly
Parts of Australia's deserts are flat and others are hilly.
Flat
flat
flat in the north (near the sea) to mountained in the south (part of the Alps)
Yes, Haiti's terrain is generally characterized by mountainous and hilly landscapes. The country is marked by rugged terrain, with steep slopes and valleys throughout.
Flat
is golden sands hilly or flat
relatively flat
Extremely flat
Greece is mostly hills and mountains.
Belgium is flat