city, North Rhine–Westphalia Land (state), western Germany. It lies in the Seven Hills (Siebengebirge), on the right (east) bank of the Rhine River, just southeast of Bonn. The Drachenfels (“Dragon's Rock”), a hill 1,053 feet (321 metres) high, is crowned by a ruined castle built in the 12th century by the archbishop of Cologne and destroyed by the French in the 17th century. According to the Nibelungen legends, the Drachenloch (“Dragon's Cave”) in the hill sheltered the dragon slain by the hero Siegfried. The city is a centre for a resort area. The hillside quarries supplied stone for the building of the Cologne cathedral. Heisterbach, a ruined Cistercian abbey, is nearby. Pop. (2003 est.) 40,625.