This is the Tamar River in Northern Tasmania. I'm standing at the Tamar Valley Lookout. 

The Tamar River, is officially called kanamaluka / River Tamar. It is a 70 kilometre (43 mile) estuary located in Northern Tasmania, Australia. It is a very tidal river so a lot of seawater gets pulled in and out of this River making its water rather salty. Here is a short video showing its beauty from one of the Tamar Valley lookouts. Tasmania is by far my favourite place in Australia.