Vivonne Bay (South Australia)

Vivonne Bay
View of Vivonne Bay at sunset
Vivonne Bay Location in South Australia
Location	Kangaroo Island, South Australia
Coordinates	35°58′53″S 137°10′50″E / 35.98139°S 137.18056°E / -35.98139; 137.18056Coordinates: 35°58′53″S 137°10′50″E / 35.98139°S 137.18056°E / -35.98139; 137.18056
Type	Bay
Primary inflows	Eleanor River Harriet River
Basin countries	Australia
Frozen	never
Settlements	Vivonne Bay

Vivonne Bay (French: Baie Vivonne) is a bay in the Australian state of South Australia located on the south coast of Kangaroo Island about 61 kilometres (38 mi) from Kingscote, the island's main town, and which was named by the members of Baudin expedition to Australia who visited the bay in January 1803. In a survey of 10,000 beaches by Professor Andrew Short, director of Sydney University's marine studies centre, the beach at Vivonne Bay was adjudged as one of the best in Australia.

Vivonne Bay is located on the south coast of the Kangaroo Island in South Australia overlooking the body of water known in Australia as the Southern Ocean and by international authorities as the Great Australian Bight about 61 kilometres (38 mi) south-west of the municipal seat of Kingscote.

Vivonne Bay has been described in an American source as being “a bight in the coast” between Point Ellen in the west and the Eleanor River in the east which is referred to as being the ‘Mary River’ and which is located about 1.75 nautical miles (3.24 km; 2.01 mi) north-northeast of Point Ellen. While the American source does nominate an eastern extremity, the official Australian source does not.

The depth of water within the bay is reported as being in the range of 9.1 to 11 metres (30 to 36 ft). The bay is reported as being suitable as an anchorage where there is a need to shelter from northerly and westerly winds. However, the bay is considered to be unsuitable as an anchorage in the case of “fresh SE winds” as “there is no space to get underway if the wind increases and a sea is raised.”

The bay’s coastline consists of a curved sandy beach of about 5 kilometres (3.1 mi) in length with a western end relatively sheltered from wave action by Point Ellen and an eastern end that is subject to “higher wave energy” with the result of “well-developed offshore bars” being formed and the Eleanor River being “constricted due to the large volumes of marine-sourced sand” being recycled and trapped in its mouth. Point Ellen is described as being “a grassy mound 8.5m high” that is “bordered by low rocks at its base” and is formed of a “ aeolianite, i.e. a “dune limestone.” Two rivers, the Harriet and the Eleanor, flow into the bay with the Harriet being located at the west end and the Eleanor located at the east end. The Harriet River has an estuary coastal lagoon system at its mouth due to the local absence of the “bedrock cliffs” that dominate Kangaroo Island’s coastline.