Ewens Ponds

Ewens Ponds
Ewens Ponds, ca. 1945
Ewens Ponds Location in South Australia
Location	South Australia
Coordinates	38°01′36″S 140°47′26″E / 38.02667°S 140.79056°E / -38.02667; 140.79056
Type	Cenotes
Primary outflows	Eight Mile Creek
Catchment area	spring-fed water body
Basin countries	Australia
Max. length	Pond 1 - 50 metres (160 feet) Pond 2 - 38 metres (125 feet) Pond 3 - 19 metres (62 feet)[1]
Max. width	Pond 1 - 32 metres (105 feet) Pond 2 - 38 metres (125 feet) Pond 3 - 28 metres (92 feet)[1]
Average depth	Pond 1 - 9 metres (30 feet) Pond 2 - 9 metres (30 feet) Pond 3 - 13 metres (43 feet)[1]
Max. depth	13 metres (43 feet)[1]
Water volume	Pond 1 - 28,000 cubic metres (990,000 cubic feet) Pond 2 - 212,000 cubic metres (7,500,000 cubic feet) Pond 3 - 4,400 cubic metres (160,000 cubic feet)[1]
Residence time	Pond 1 - 6 hours Pond 2 - 3 hours Pond 3 - 1.5 hours[1]

Ewens Ponds is a series of three water-filled limestone sinkholes in the state of South Australia located in the gazetted locality of Eight Mile Creek, on the watercourse of Eight Mile Creek about 25 kilometres (16 miles) south of Mount Gambier and 8.4 kilometres (5.2 miles) east of Port MacDonnell.^[2] The ponds are popular with recreational divers due to their excellent underwater visibility. It has a small fish population including the endangered golden pygmy perch. Ewens Ponds has been part of the Ewens Ponds Conservation Park since 1976.