Guichen Bay
| Guichen Bay | |
|---|---|
The Robe Obelisk
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 Guichen Bay
Location in South Australia
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| Location | Limestone Coast, South Australia |
| Coordinates | 37°7′14″S 139°45′58″E / 37.12056°S 139.76611°ECoordinates: 37°7′14″S 139°45′58″E / 37.12056°S 139.76611°E |
| Type | Bay |
| Basin countries |
 Australia
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| Max. length | 6 kilometres (3.7 mi) |
| Max. width | 3.4 kilometres (2.1 mi) |
| Max. depth | 11.3 metres (37 ft) |
| Settlements | Robe |
Guichen Bay, (French: Baie de Guichen) is a bay located on the south-east coast of South Australia about 115 kilometres (71 mi) northwest of Mount Gambier and about 270 kilometres (170 mi) south-southeast of Adelaide. It was named in 1802 by the Baudin expedition of 1800-03 after Luc Urbain de Bouëxic, comte de Guichen. The town of Robe is located at the southern end of the bay.
Guichen Bay lies between Cape Thomas at its northern extremity and Cape Dombey at its southern extremity on the south-east coast of South Australia. The east side of the bay which runs for a distance of about 6 nautical miles (11 km; 6.9 mi) to the south of Cape Thomas is formed by a sandy beach known as Long Beach. The bay’s south shore of the bay consists of ‘rocky points and sandy bays’ with ‘drying rocks extend a short distance offshore’. Within the bay, the water depth ranges from 9.1 metres (30 ft) to 11 metres (36 ft) over a large part of the bay. A rocky point known as Boatswain Point projects south for a distance of about 0.75 nautical miles (1.39 km; 0.86 mi) to the east southeast of Cape Thomas while at the south end of the bay, there is a rocky point known as Robe Point.
A number of navigation aids are located around Cape Dombey at the bay’s south end. These consist of a lighthouse known as the Robe Lighthouse on Cape Dombey, a flashing light located near Commodore Point on the ocean coastline to the immediate south of Cape Dombey, and two lights within the bay - a light marking the end of the breakwater at the entrance of the Lake Butler marina in Robe and a flashing light near Robe Point. Prior to the erection of the Robe Lighthouse in 1972, the sole navigational aid available for navigating in Robe was a Daymark in the form of an obelisk painted with red and white bands which is known as the Robe Obelisk.
Guichen Bay was named in 1802 by Peron and Freycinet of the Baudin expedition of 1800-03 after Luc Urbain de Bouëxic, comte de Guichen.
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