the northern side of the sound, is also a hilly area. Villages to the south of Aalborg from west to east include Frejlev, Svenstrup, and Gistrup (which contains extensive woodland to the south as well as a golf club). Klarup and Storvorde lie to the southeast along the 595 road, which, flanking a stretch of the Limfjord known as Langerak, leads to the town of Hals. Nibe, with a harbour on the Limfjord, is to the southwest, past the village of Frejlev. The Nibe Broads (Nibe Bredning) in the Limfjord not only has the largest eelgrass belts in Danish waters but is an important sanctuary for thousands of migratory birds. To the north of the city, villages include Vadum, Aabybro, Vestbjerg, Sulsted, Tylstrup, Vodskov, and Hjallerup. There is an extensive plantation, Branths Plantage - Møgelbjerg, immediately north of Vodskov. The Himmerland region to the south still has a number of moors which once formed a vast area of heathland extending to the Rold Forest near Arden. Rebild Hills in the Rold Forest stretch over of rolling heath country about south of Aalborg. Lille Vildmose, to the southeast, is reported to be the largest raised bog in north-western Europe. The city The city centre, dating from the Middle Ages, lies on a series of clay banks between the former streams of Vesterå and Lilleå, which used to run into the sound. Despite effective drainage, the main streets, including Algade, still run east to west while the side streets run north to south. The Budolfi Church and the old town hall line Gammeltorv, the old market square. The main shopping streets are Algade and Bispengade, the latter lying in between the modern Vesterbro thoroughfare and Nytorv square. Østerågade, once the old harbor, is noted for its merchants' mansions. The city cemetery, the Kilden park and the modern art museum, Kunsten, are in the modern commercial and administrative area around the railway station to the west. Beyond this, Hasseris has become a residential district with a number of large villas and detached houses. The city's main development area is now to the east of the centre although in addition to the university and new areas of housing, it still contains the shipping harbor, Østhavnen, and the cement factory. The waterfront to the northeast of the centre is being transformed from a harbour into a recreational area with the Utzon Center and Musikkens Hus.