ALTENA  , a

town of Germany, in the Prussian province of Westphalia, on the river Lenne, 38 m . S.S.E. from Dortmund . Pop . (1900) 12,769 . It consists of a single street, winding up a deep valley for about 3 M . There are three churches, a museum, high grade and popular schools . Its hardware industries are important, and embrace iron rolling, the manufacture of fine wire, needles, springs and silver ornaments . On the neighbouring Schlossberg is the ancestral castle of the counts of La Marck, ancestors, on the female side, of the Prussian royal house .