If we had a square of side length 1cm, it would correspond to a square of side lengths 300,000cm. So a square with area would correspond to a square of area .
So if the area on the map is then it would correspond to an area of .
Since there are 100cm in 1 metre, there are in .
So that means that .
Since there are 1000m in 1km, there are in .
Therefore the actual area that is represented by this map is .