The Monaro region is a plateau area about 1000 m above sea level . It lies between the valley of the Murrumbidgee River in the north , and the Errinundra Plateau in the south . The Monaro region is a plateau area lying about 1000 metres above sea level , extending from the valley of the Murrumbidgee River in the north to the Errinundra Plateau in the south , and dropping rather sharply to the coast on its eastern side .