The Island Archway, Loch Ard Gorge, Victoria
Continuing the east-to-west tour of Loch Ard Gorge, The Island Archway is the next item on the list, at about 38°38′55.69″S, 143°04′14.17″E (Google Maps).
I've downloaded a Wikipedia public domain picture of one of the Loch Ard Gorge signs for you to peruse. You'll see The Razorback to the far left, and then The Island Archway as you move right.