... over 2,482 km², but the boundary of the park is quite irregular as it is broken up by roads, urban areas and inholdings. Despite the name \'mountains\', the park is actually an uplifted plateau, dissected by a number of larger rivers. The highest point in the park is Mount Werong (1215 m), while the low point is on the Nepean River (20 m) as it leaves the park. The mountains received their name due to the blue tinge that they have in summer, a result of oil haze from the plentiful eucalyptus trees.