What are Hectares?
A hectare is 10,000 square meters, or about 2.47 acres. It is the usual metric unit for land, so farms, parks and forests are measured in hectares.
A hectare is the area of a square 100 meters on each side. The name is 'hecto-' plus are, an are being 100 square meters, so a hectare is 100 ares.
What are Square Kilometers?
A square kilometer is the area of a square with sides 1 kilometer long, which is 1,000,000 square meters or 100 hectares. Australia covers about 7.7 million of them.