Murrell River rises on Mount Challenger, but tributaries coming off Mount Kent, Harriet and Two Sisters... it could be seen as part of the catchment area.
Port William has several other bays on it - Gypsy Cove and Yorke Bay which is a noted beauty spot, Hearnden Water, which is effectively the estuary of the Murrell River and Weir Creek, Blanco Bay and Sparrow Cove.
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