Öskjuvatn (Icelandic pronunciation: [ˈœscʏˌvahtn̥] ^ⓘ, "Askja Lake") is a lake in the Highlands of Iceland. Its surface area is about 11 km². With a depth of 217 m (712 ft), it is the second-deepest lake in Iceland after Jökulsárlón.^[1][2]

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Öskjuvatn
The ice on Öskjuvatn melting in early 2023
Öskjuvatn
Coordinates	65°02′N 16°45′W
Basin countries	Iceland
Surface area	11 km2 (4.2 sq mi)
Average depth	109 m (358 ft)
Max. depth	217 m (712 ft)[1]
Water volume	1.2 km3 (0.29 cu mi)
Surface elevation	1,053 m (3,455 ft)

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The lake is situated in the crater of the volcano Askja in the northeast of the glacier Vatnajökull. The name Öskjuvatn simply means Askja lake. Like the neighbouring crater Víti, it was created by an enormous volcanic eruption in 1875.^{[citation needed]}

On July 10, 1907, two German scientists, Walter von Knebel and Max Rudloff disappeared while exploring the lake in a small boat. Knebel's fiancée, Ina von Grumbkow, led an expedition in search of them with a vulcanologist Hans Reck, but no trace of them was ever found. Suppositions at the time suggested that seismic volcanic disturbances could have caused a landslip or similar occurrence, and recorded that only two days previously the telegraph cable to Iceland had been broken by deep water disturbances for the first time since it was laid, close to the Icelandic coast.^{[citation needed]}

• Geography of Iceland
• Iceland plume
• List of lakes of Iceland
• List of rivers of Iceland
• Volcanism of Iceland