Sof Omar Caves

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What Wikipedia says

Sof Omar Caves is the longest cave in Ethiopia at 15.1 kilometres (9.4 mi) long. When surveyed in 1972, it was the longest cave in Africa. Since then explorations in Madagascar (Marosakabe - 113km) and Algeria (Rhar Bou Ma’za - the Tafna River Cave 18.4 km) have overtaken it.

Excerpt from the Wikipedia article “Sof Omar Caves”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rod Waddington from Kergunyah, Australia, CC BY-SA 2.0, via Wikimedia Commons.