Postcard Fort Denison Fort Denison, part of the Sydney Harbour National Park, is a protected national park that is an heritage-listed former penal site and defensive facility occupying a small island located north-east of the Royal Botanic Gardens and approximately 1 kilometre (0.62 mi) east of the Opera House in Sydney Harbour, New South Wales, Australia. The island was formerly known in its indigenous name of Mat-te-wan-ye, and as Pinchgut Island. |