Bathers in The Grotto, showing algae coloured limestone. [1321]![Bathers in The Grotto, showing algae coloured limestone. [1321]](aussiePlaces/christmasisWA/fulls/beaches/09-GOPR1321.jpg "Bathers in The Grotto, showing algae coloured limestone. [1321]")
Close to the east coast is the Grotto, a beautiful subterranean pool somehow linked to the ocean. The green colours are chlorophyll-based algae. The pink colours are Crustose Coralline Algae from the sea. [1321]