There is a lot of quite flat land in the centre of Ireland, but there are lots of mountains around Ireland too, so it is both smooth and hilly.
Both, depending on your location
It is kinda both. =)
Belgium is flat
hilly
both, there are mountains in the east, yet flat lands in the west and south
Both, The Canterbury plains on the east coast of the south island of New Zealand is very flat but the fiordlands are so hilly most of it is uninhabitable to humans
Parts of Australia's deserts are flat and others are hilly.
Flat
flat
The opposite of hilly is flat or level.
flat in the north (near the sea) to mountained in the south (part of the Alps)