وادي النطرون
"Cyperus microcristatus" (from Cameroon) and "C. multifolius" (native to Panama and Ecuador) are possibly extinct; the former was only found once, in 1995, and the latter has not been seen in the last 200 years. The "true" papyrus sedge of Ancient Egypt, "C. papyrus" subsp. "hadidii", is also very rare today due to draining of its wetland habitat; feared extinct in the mid-20th century, it is still found at a few sites in the Wadi El Natrun region and northern Sudan.