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The network of the Alberche and Guadarrama rivers, obtained by a semicuantitative method, shows that on the granitic and metamorphic rocks of the Spanish Central System exist circular alignments, until now detected by analysis of satellite image. Such alignments are located in the sub-geological system of the Sierra de Guadarrama, and they coexist with to already known rectilinear alignments. In the sub-westem system, Sierra de Gredos, are detected rectilinear alignments. The circular structures of Sierra de Guadarrarna would have a relationship to geological processes still unknown after the Hercynian Orogeny but before of the Oligocene.  Utilizando una metodolog&#237;a semicuantitativa, las redes de drenaje de los r&#237;os Alberche y Guadarrama ponen de manifiesto que existen alineaciones circulares sobre las rocas gran&#237;ticas y metam&#243;rficas de la Cordillera Central, cuya presencia hasta ahora se hab&#237;a detectado por an&#225;lisis de imagen de sat&#233;lite. Tales alineaciones se sit&#250;an en el subsistema geol&#243;gico de la Sierra del Guadarrama, en donde coexisten con alineaciones rectas ya conocidas. En el subsistema occidental, la Sierra de Gredos, se detectan alineaciones rectas. Las estructuras circulares de la Sierra de Guadarrama tendr&#237;an su origen en relaci&#243;n con procesos geodin&#225;micos todav&#237;a desconocidos, ocurridos con posterioridad a la Orogenia Herc&#237;nica, pero antes del Oligoceno

Las redes de drenaje de los rios Alberche y Guadarrama como indicadores estructurales del Sistema Central Espanol