The island's granite boulders are approximately 485 million years old.
The orange color on the granite rocks is caused by Caloplaca elegans, a type of crustose lichen.
The little penguin colony on the island is a major focus of ongoing local conservation and monitoring efforts.
The wooden causeway connecting the island to the mainland is a historic structure dating back to the late 19th century.
The island serves as an important site for nesting seabirds, including silver gulls and crested terns.
Granite Island Recreation Park is a protected nature reserve connected to the Victor Harbor mainland by a man-made causeway. The island is most notable for its colony of little penguins, the smallest species of penguin in the world. Visitors can traverse the island via the Kaiki Walk, a coastal trail that circles the granite rock formations. The park provides designated picnic areas and observation decks overlooking the Southern Ocean. During winter, the surrounding waters serve as a seasonal transit point for migrating southern right whales. The landscape is defined by large, weathered granite boulders covered in orange lichen. The area is managed by the South Australian Department for Environment and Water to protect native flora and fauna. Facilities include public restrooms, interpretive signage, and guided tour hubs.
The elevated boardwalk and viewing platforms on the southern side of the island offer clear vistas of the ocean and granite boulders.
Wear sturdy walking shoes to navigate the uneven granite terrain and coastal paths.
Bring wind-resistant clothing, as the island is exposed to strong ocean breezes regardless of the season.
Pack your own food and water, as there are limited options for purchasing supplies once on the island.
Do not attempt to feed or approach the penguins, as they are easily stressed and protected by wildlife regulations.
Stay on marked trails to protect penguin burrows and do not use flash photography near wildlife.
