Trewalla Campsite is a sheltered hike-in camping area on the Great South West Walk in Victoria, set just back from the Southern Ocean swells of Bridgewater Bay.

The site features an observation platform offering views back toward Cape Bridgewater, with Cape Nelson visible across the bay. The surrounding trail alternates between coastal cliff-top vistas and low coastal scrub.

The area takes its name from nearby freshwater springs, where water filters through porous limestone before meeting an impermeable basalt layer below.