Kef Toghobeit Cave
Kef Toghobeit is a karst cave near the settlement of Bab Taza in Chefchaouen Province, Tanger-Tetouan-Al Hoceima, in northern Morocco. Currently known to be long and deep, it is the deepest cave in Morocco, and the third deepest cave in Africa.
Although Kef Toghobeit has been well-explored, its full extent is not yet known. Indeed, the karst topography of the Rif mountain range where the cave begins has barely been mapped - just 1000 caves are known in Morocco, and the geology would suggest that more than this exist.
Xe Bang Fai River
Xe Bang Fai River Cave, also known as Khoun Xe Cave (Tham in Laotian is "Cave"), is an immense river cave located in a remote corner of Khammouane Province. It is believed to be one of the largest river cave in the world with enormous passages some 120 meters tall and 200 meters wide, and subterranean channel 7 km long.