Port McDonnell and the South Australia/Victorian border. Port McDonnell is on the most southern tip of South Australia. A pretty little town. It was once the second largest port in South Australia. A sleepy pretty town. Strong smell of seaweed along the beach near town. We drove out of town a little to a lookout. The water was an amazing shade of deep blue through to green. Lots of little caves and coves. Would have been lovely to snorkel there.