Waterous Loop is a 40.6 mile loop trail located near Waroona, WA. The trail is rated as moderate and primarily used for mountain biking.
A long but easy loop that is part of the Munda Biddi trail with the option of splitting the ride over 2 days. The route is very well signposted with orange Waterous Loop markers, similar to the blue and yellow ones used on the Munda Biddi Trail. In addition a map to accompany the trail is available from the Munda Biddi Foundation and most good bike shops and outdoors shops in Perth. The ride is very similar in either the clockwise or anti-clockwise direction due to the gradual gradient of the hills. There aren't really any options to shorten the route but it would be possible to ride it over two very leisurely days staying at either Lake Navarino caravan park, Nanga camp ground or the Munda Biddi shelter at Bidjar Ngoulin.