Mountains, Ridges and Megalong ValleyThe Blue Mountains has deep valleys, lined by ridges. This prevented the early colonial settlers from exploring west for many years. The first succesful route for colonial explorers was found by by Maitland, Lawson and Wentworth who crossed the Blue Mountains in 1813.Needless to say, Australian Aboriginals had been crossing the Blue Mountains for thousands of years. Description: Steep Ridges and Valleys. | 
