Diamond Island also known locally as Cod Rock, is a low granite island with an area of 6.76 ha. Diamond Island lies roughly 200m off the central east coast of Tasmania and has a maximum elevation of 9m.
It is located just off the town of Bicheno. Depending on the tide it is connected to the mainland by a sand spit during which time it is accessible by foot. It is a nature reserve.
The island is a little penguin rookery numbering 200 breeding pairs. Species of seabird and wader have also been recorded breeding on Diamond island including the sooty oystercatcher.
41ð51'30"S 148ð17'23"E