Arendal, a town of S. E. Norway, on a river of the same name, in the province and 40 m. N. E. of Christiansand; pop. in 1865, 7,181. It is built on piles and islands, and has been called "Little Venice" on account of its canals and picturesque appearance. The harbor is protected by the opposite island of Tromo, and there is an active trade in iron and timber.