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 On 10 December 2012, the rebels from Séléka seized Ouadda, as well as weapons left by fleeing soldiers. In 2021 Ouadda was under control of ex-Sélék ...
in the
Haute-Kotto Haute-Kotto is one of the 16 prefectures of the Central African Republic. Its capital is Bria. It is the largest prefecture in the Central African Republic The Central African Republic (CAR; ; , RCA; , or , ) is a landlocked country in C ...
prefecture of the
Central African Republic The Central African Republic (CAR; ; , RCA; , or , ) is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the southeast, the DR Congo to the south, the Republic of th ...
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 g ...
, has carved out a gorge in the
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates ...
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 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 area. Water ...
. 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