Central March

The stability of the frontier in Spain between the late 8th and the early 11th centuries is responsible for the outsized role and relatively well-defined nature of the thughūr there.Late in the reign of the Emir Muḥammad I (852–886), there was a chain of fortresses stretching from Bārūsha to Toledo at Madrid, Talamanca, Canales, Olmos and Calataifa.[3] This expanded march included the Sierra de Guadarrama north of Madrid and a string of fortresses along the Tagus.According to Aḥmad al-Rāzī, its northern extensions towards the Duero comprised the districts of Santaver, Racupel, Zorita, Guadalajara and Medinaceli with their fortresses, including Castejón de Henares, Uclés, Cuenca, Huete and Huelamo.The Reconquista (Christian reconquest) of the northern lands of al-Andalus (Islamic Iberia) had rendered the old system of fortresses and districts impossible.
The Central March (Spanish Marca Media ) in the Caliphate of Córdoba (green)
ArabicromanizedmarchesEmirateCaliphate of CórdobaTagus valleyLower MarchUpper MarchToledoMedinacelial-thughūrthe dār al-ḥarb and the dār al-islāmDarocaMolinaMuḥammad IMadridTalamancaCanalesʿAbd al-Raḥmān IIISierra de GuadarramaAḥmad al-RāzīZoritaGuadalajaraCastejón de HenaresUclésCuencaHuelamoTalaveraCoimbraReconquistaal-AndalusWāḍiḥ al-ṢiqlabīCollins, RogerBearman, P. J.Bianquis, Th.Bosworth, C. E.van Donzel, E.Heinrichs, W. P.