Myponga Beach is a locality in the Australian state of South Australia about 54 kilometres (34 miles) south of the state capital of Adelaide. It is on the eastern shore of Gulf St Vincent, immediately north of the northern boundary of the Fleurieu Peninsula. The locality extends from Snapper Point (at the southern end of Aldinga Bay) in the north to Carrickalinga Point about 18.7 km (11.6 mi) to the south-west. The coastline includes an inlet known as Coweelunga Bay; on its shores are a popular beach (known colloquially as Myponga Beach) and the mouth of the Myponga River.