Pipi Natural Bridge
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The Pipi Natural Bridge is geological formation near
Ouadda Ouadda is a town located in the Central African Republic prefecture of Haute-Kotto. History Around November 2006, UFDR captured Ouadda. On 1 December 2006, FACA recaptured the town after facing a fierce battle with UFDR. On 10 December 20 ...
in the
Haute-Kotto Haute-Kotto (, "Upper Kotto") is one of the 20 prefecture A prefecture (from the Latin word, "''praefectura"'') is an administrative jurisdiction traditionally governed by an appointed prefect. This can be a regional or local government subdiv ...
prefecture of the
Central African Republic The Central African Republic (CAR) is a landlocked country in Central Africa. It is bordered by Chad to Central African Republic–Chad border, the north, Sudan to Central African Republic–Sudan border, the northeast, South Sudan to Central ...
in which the Pipi River, a tributary of the
Kotto River The Kotto River (or Koto River) is a tributary of the Oubangui River in the Central African Republic. Its source is on the south side of the Bongo Massif, near Mount Toussoro on the border between the Central African Republic and Sudan. It flows ...
, has carved out a gorge in the
sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...
terrain forming a natural arch.http://www.hydrosciences.fr/sierem/produits/biblio/carte%20oro-hydrographque%20de%20la%20république%20centrafricaine.pdf p. 30 The sandstone arch is a single slab of sandstone, whose top is nearly above the water level. Although it is not known how it was formed, the surrounding terrain offers some clues. It is suspected that the top of the bridge was once part of the river bottom itself, as both the bridge and the current river bottom bear similar
potholes A pothole is a pot-shaped depression in a road surface, usually asphalt pavement, where traffic has removed broken pieces of the pavement. It is usually the result of water in the underlying soil structure and traffic passing over the affected ...
. Upstream, rocky projections on the walls of the river gorge seem to suggest that a once-extant tunnel collapsed there. It has been suggested that the Pipi Natural Bridge is all that remains of that former tunnel.


References

Landforms of the Central African Republic Haute-Kotto {{regional-geology-stub