- TheruggedWolganValleyintheGreaterBlueMountains,justoutsideSydney,containsseveralpopularcanyoneeringspots.Thedangerousofcanyoneeringwouldrockfall,faultyanchorsystem,flashflooding,aswellascoldwater,coldair,changeofhypothermia,andlittleornochanceonrescu...
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