GRENZMARK (Grenzmark Posen-West Preussen), prov ince within the Land of Prussia, composed of what remains to Germany of the former provinces of Posen and West Prussia. It consists of two separate parts lying along the Polish frontier, one north of the Netze and the other mainly south of the Warthe. The area of the northern is 2,232 sq.miles (pop. and of the southern Q59 sq.miles (pop., their density per square mile being respectively 11o•8 and 117.9. They are bounded on the west by Pomerania, Brandenburg (which separates them) and Silesia. The province is a low plateau, high est in the north, covered with glacial and related deposits, and dotted with small lakes. The temperature ranges annually from a January average of 3o° F to a July average of 64° F, while the average annual rainfall is about 20 inches. The province is agricultural and pastoral, the chief crops being cereals and po tatoes, and the industries are brewing and the manufacture of agricultural machinery and starch. A little tobacco is grown and manufactured, while there is some trade in timber and leather.