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The bay shelters a 1 km stretch of white sandy beach between Henrietta Rocks (home to the famous Shark shipwreck) and scenic Parker Point. Snorkelers can explore the cave systems teeming with fish, with depths ranging from 8 m to 18 m, and occasional sightings of sea turtles and leafy sea dragons in the clear, calm waters.","intermediate","published",{"name":58,"amplitude":74,"phase":90,"latitude":22,"model":106,"epoch":107},[59,60,61,62,63,64,65,66,67,68,69,70,71,72,73],"2N2","J1","K1","K2","M2","M4","MF","MM","N2","O1","P1","Q1","S1","S2","T2",[75,76,77,78,79,80,81,82,83,84,85,86,87,88,89],0.004246646050641868,0.00929715593939091,0.16671990024248595,0.013763551056940972,0.05442926686434654,0.004831037571235754,0.005031046440380575,0.004593391224684983,0.013459586396300377,0.12210902263225695,0.05066823186019397,0.023037956390366602,0.013620958504661312,0.04165109266427433,0.002988107938348202,[91,92,93,94,95,96,97,98,99,100,101,102,103,104,105],38.07168459976013,226.5547116816707,181.76307460570933,39.03973987574349,58.69595906491372,131.53454162642942,33.33911075183571,222.96465763182368,105.85905092868404,176.01364000372735,171.0963195429075,173.02286853875765,319.8592487484466,64.23281584403975,227.84649155086737,"EOT20","1992-01-01T00:00:00Z",[109,114,117,120],{"name":110,"description":111,"severity":112,"season_start":113,"season_end":113},"Underwater cave navigation","The limestone caves and swim-throughs can be disorienting; limited overhead clearance and light reduction inside caverns require good buoyancy control.","caution",null,{"name":115,"description":116,"severity":112,"season_start":113,"season_end":113},"Boat traffic","Porpoise Bay is accessible to moored boats, and vessels may transit through the bay, especially near Henrietta Rocks.",{"name":118,"description":119,"severity":112,"season_start":113,"season_end":113},"Depth variation","Depth ranges from shallow shoreline to around 18 m at the outer cave entrances, which may surprise less experienced snorkelers.",{"name":121,"description":122,"severity":112,"season_start":123,"season_end":124},"Swell exposure","As a south-facing bay, Porpoise Bay can be affected by southern ocean swells and winter storms, reducing visibility.",5,9,{"directions":126,"parking":127,"facilities":128,"fees":130,"access_method":131},"Porpoise Bay is on the southern side of Rottnest Island, easily reached by bicycle or the island bus service from the main settlement at Thomson Bay. Follow the South Perimeter road towards Parker Point — the bay is the first large beach east of Parker Point.","No car parking on Rottnest Island (cars are prohibited). Bicycle racks are available near the beach access points. 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