Simplify the following text for a Grade 7 native English-speaking person.
Original: The Monaro region is characterised by rolling hills that rise to extremely rugged peaks in the Tinderry Mountains and to shallow valleys in the upper Murrumbidgee .
Simplified: The Monaro region features rolling hills that rise to very rugged peaks in the Tinderry Mountains . There are shallow valleys in the upper Murrumbidgee .