HAFF, or STETTIN HAFF, a lagoon in the Prussian province of Pomerania, lying N. of Stettin, and communicating with the Baltic by several mouths. It is about 30 miles in length from E. to W., by about 12 miles in breadth; and is divided into the Great and Little Haff. It receives the Oder, Inna, Ucher, and Peene rivers.