Voltoya River province of Ávila and enters that of Segovia , to pass through Juarros de Voltoya and the Nava de la Asunción. Voltoya River The Voltoya is a river in Spain. It is a tributary river of Eresma River which is, in turn a tributary of the Adaja River that emerges from Douro River. Its starts in the mountains of Guadarrama and Malagón. The water from Dehesa de la Cepeda , enclave of the city of Madrid and the Azálvaro Field also flow into the Voltoya . It runs through the Castilian-Leonese provinces of Ávila and Segovia . Its mouth is
Grejs River Grejs River Grejs River () is an approximately river in Vejle Municipality in Denmark. Its source is Fårup Lake, south of the village of Jelling. It starts by heading east through a tunnel valley, then turns south to run through Grejs Valley (), the largest gorge in Denmark, until it reaches the city of Vejle. North of Vejle, it splits into two branches, Omløbsåen ("Bypass River") and Mølleåen ("Mill River"). Omløbsåen runs west around the city centre to meet Vejle River, while Mølleåen flows through the city and empties into Vejle River just south of the city centre. A section