Location: Point Lonsdale
State: VIC
Diver Qualification: Open Water
Average Depth: 18mtrs
Max Depth: 19mtrs
Average Visibility: 10mtrs
Access Type: BOAT
Directions: Use any of the charters running from Portsea or Queenscliff.
Description: Castle Rock is basically a square lump of rock sitting alone in an area with a limestone and sand bottom. The top of the rock is at 12m and usually the shot line is dropped right on top to allow divers to adjust their gear before "plunging" over the edges of the rock formation.

The site has lots of macro fauna all over it with lots of nudibranchs grazing. One wall is covered in tiny yellow zoeanthids. There are of undercuts at max depth where you may sight a cray, or two, usually missing their horns from past encounters with divers. Southern Blue Devils also hide in the cracks and holes. Great site on a good day!!