Alto Tajo and headwaters · memory of the water
Arandilla: red sandstone waters toward the Gallo
Descending from the Sierra de Aragoncillo, carving a red rodeno canyon in Cobeta past the Montesinos hermitage, joining the Gallo.
- Headwaters
- Slopes of the Sierra de Aragoncillo.
- downstream
- Gallo; its waters subsequently reach the Tagus.
The Arandilla descends from the Sierra de Aragoncillo. Aragoncillo is an upland village of the Señorío de Molina at 1,260 metres, surrounded by a 300-million-year-old fossil conifer forest petrified by volcanic ash.
At Cobeta, the stream carved the Barranco del Arandilla, a canyon of Triassic red sandstone and conglomerate—an unusual formation in Iberia, where most gorges are cut through limestone. Its sculpted red cliffs shelter the Hermitage of the Virgen de Montesinos and Georoute 3.
The name Montesinos derives from tradition: local lore places a 10th-century Muslim warrior named Montesinos at a fortress overlooking the river junction. Cobeta remains surrounded by extensive pine forests with a long resin-tapping heritage.
Memory we can follow
16th century – today
Festivals of the Señorío
The Hermitage of the Virgen de Montesinos is a cornerstone of traditional pilgrimages and festive rites in the Señorío de Molina.
Read the story →450 million years ago – today
Rocks from deep time
The red sandstone of the canyon originates from Triassic river systems, while in Aragoncillo a petrified conifer forest preserves an even more ancient era.
Read the story →1936 – 1939 and the postwar years
Pine forests and war
Among the resin workers of the LURE forestry enterprise mobilized during the Civil War were eighteen men from Cobeta.
Read the story →Villages to read this basin from
These are gateways to its headwaters, valleys, and memory. The selection gathers regional villages; it does not imply the entire municipality drains into this river.
Traces of the river and its basin
Lands united by water
Sources of this reading
Linked memory stories include their own cited sources. Fluvial connections refer to this specific stream; names like Salado and Tajuelo also recur in other basins.