Hat Hill Creek flows from the northern side of Blackheath to the Grosse Valley parallel with Hat Hill Road.The creek is reatively easy to negotiate with some scrambling over rocks and two small waterfalls. There are some lovely constricted canyon sections and excellent views where Hat Hill Creek plunges into the Grose Valley. Returning upstream we scramble out and follow a ridge over Hat Hill. Wet suits are recommended. Helmets are optional as no abseiling is involved.