Lake Guinas
Maximum depth from the 2019 SUNFISH survey; the Namibian Sun gives 130 m. Divers reached 132 m in 1988 on the eastern side.
A deep, clear sinkhole lake on private farmland west of Tsumeb, home of the critically endangered Guinas tilapia. A 2019 robotic survey mapped it to 133 m; divers have reached about 130 m.
Lake Guinas is a sinkhole lake on private farmland between Otavi and Tsumeb in northern Namibia. At the surface it is a narrow pool about 120 m long and 59 m wide, set about 30 m below the surrounding ground behind vertical walls.
Underwater the lake widens. The 2019 SUNFISH sonar survey described an hourglass shape about 300 m long and 175 m wide near the bottom, with a maximum depth of 133 m. Divers have worked here since at least the 1980s: Boetie Scheun reached 132 m on the eastern side in 1988, Nuno Gomes 123 m in 1999, and in 2024 a German team dived to 113 m with one diver going to 130 m.
The lake is biologically important as the natural home of Tilapia guinasana, a small cichlid fish endemic to Namibia and classed as critically endangered. Divers have also reported living stromatolites (layered mats built by microbes) and old stalactites that formed when the water table stood lower.
Lake Guinas has also seen drownings, with police reporting that bodies have not been recovered because of the complex underwater shape. The lake is on private land and visits depend on the landowner's permission.
भूविज्ञान
Guinas is a collapse sinkhole in karst. Stalactites below today's water level show that parts of the cave were once air-filled, when the water table was lower.
पानी, प्रवाह और बाढ़
A 2008 expedition reported water at about 26 C and described it as clear. The lake is believed by some to be connected with Lake Otjikoto through underground caves, but this has not been proven.
यह क्यों मायने रखता है
The lake is the natural home of the critically endangered cichlid Tilapia guinasana, which is endemic to Namibia and was later introduced to Lake Otjikoto. It also contains living stromatolites. It was one of the three sites mapped by the SUNFISH autonomous vehicle in 2019.
परिस्थितियाँ
About 26 C on a 2008 expedition, with clear water; no recent measurements found.
प्रकाशित स्रोतों से सामान्य अनुमानित दायरे, वर्तमान परिस्थितियाँ नहीं।
सर्वे और एक्सप्लोरेशन इतिहास
| 1988 | Boetie Scheun reached 132 m on the eastern side. [6] |
| 1999 | Nuno Gomes reached 123 m. [6] |
| 2008-06 | Nuno Gomes and Pieter Venter dived to the eastern-side bottom at 105 m for a film expedition. [6] |
| 2019 | The SUNFISH autonomous vehicle mapped the lake to 133 m. [4] [5] |
| 2024-06 | A German cave-diving team dived to 113 m, one diver reaching 130 m. [1] |
प्रवेश द्वार और डाइव साइटें
An open-air sinkhole on private farmland; the water is about 30 m below ground behind vertical walls. Not publicly accessible.
अभिमुखीकरण के लिए, navigation के लिए नहीं। खोखले बिंदु अनुमानित हैं।
इस पृष्ठ का हर तथ्य, अपने source के साथ (13)
| तथ्य | स्थिति | स्रोत |
|---|---|---|
| Lake Guinas lies on private land west of Tsumeb, on a gravel road between Otavi and Tsumeb. | रिपोर्ट किया गया | [1] [2] |
| Area-level coordinates rounded from the published location; the lake is on private land.Rounded to 0.1 degree on purpose. | रिपोर्ट किया गया | [3] [2] |
| At the surface the lake is about 120 m long and 59 m wide. | रिपोर्ट किया गया | [1] [2] |
| The 2019 SUNFISH survey mapped Lake Guinas as an hourglass shape about 300 m long and 175 m wide at the bottom, 133 m deep.Namibian Sun (2024) gives 130 m. | रिपोर्ट किया गया | [4] [5] |
| The water surface lies about 30 m below ground level, with a vertical drop. | रिपोर्ट किया गया | [6] |
| Water temperature of 26 C was reported on a 2008 expedition. | पुराना हो सकता है | [6] |
| Boetie Scheun reached 132 m on the eastern side in 1988 and Nuno Gomes reached 123 m in 1999. | रिपोर्ट किया गया | [6] |
| In 2008 Nuno Gomes and Pieter Venter dived to the eastern-side bottom at 105 m for a film expedition, using a winch set up by Thinus van Wyk and his son. | रिपोर्ट किया गया | [6] |
| In June 2024 a German team dived to 113 m and one diver went to 130 m. | रिपोर्ट किया गया | [1] |
| Lake Guinas is the home of the critically endangered endemic Tilapia guinasana. | रिपोर्ट किया गया | [1] [7] |
| Living stromatolites and stalactites formed when the water table was lower have been reported in the lake. | रिपोर्ट किया गया | [6] |
| Police records show about three drownings in Lake Guinas with no bodies recovered; police described the submerged topography as difficult. | रिपोर्ट किया गया | [2] |
| The lake is on private land; visits are possible with the landowner's permission. | रिपोर्ट किया गया | [1] [3] |
सत्यापित: किसी आधिकारिक या प्राथमिक स्रोत से पुष्टि हुई जिसे हमने खोला। रिपोर्ट किया गया: केवल द्वितीयक स्रोत से। स्रोतों में मतभेद: नोट में दोनों संस्करण दिए गए हैं। पुराना हो सकता है: हमें मिला सबसे नया स्रोत भी पुराना है।
ऊपर दिए गए sources से हमारे अपने शब्दों में लिखा गया। सुधार की रिपोर्ट करें