 Complete the following phrase:  Historic Podlasie stretched from north to south for some 30 miles, and was located between Mazovia and Rus principalities of Brzesc and Grodno ... It was a sparsely populated province, covered by dense forests, with four major rivers: the Biebrza, the Narew, the Bug and the Krzna. Due to population growth in Mazovia and Rus, Podlasie became a settlement area - Mazovians settled near Tykocin, Rajgrod and Goniadz, while Ruthenians settled near Bielsk Podlaski. In northern districts of Podlasie, near Augustow, the Yotvingians resided ... After the 1241 