The heart of the Armenian plateau is found in the gently folded limestones and lacustrine deposits surrounding Lake Van. Here an elevated plain relieves the ruggedness of environing peaks. Here, too, our earliest knowledge of Armenian history is centered. But the formation of nationality upon the surrounding sites of intricate relief was a long-drawn process. A highland dissected into numerous valleys could not become the seat of a united people. The region, being broken up, favored division. Accordingly feudalism flourished undisturbed throughout its extent. Each valley or habitable stretch was governed by its own princeling. These petty chiefs relied on the security provided by their rugged environment and were naturally disinclined to acknowledge authority emanating from outside their valley homes. [Illustration: FIG. 61--The plain of Van. The photograph shows the three features which make the site a center of Armenian history. The plain afforded farming land and was dominated by a lone eminence to the protection of which Armenians have resorted to this very day. The broad lake in the background added to the natural strength of this position.] The plain of Van has always loomed large in the history of Armenia. This interesting depression occupies the southeastern corner of the great central plateau and lies surrounded by volcanoes which were centers of lively eruptive activity during the Pleistocene. Together with the plain of Mush it forms a single basin which was once a lake bed. The heavily saline waters of Lake Van still cover its deepest section. The exposed lake bottom consists of volcanic matter carrying fertilizers in abundance. Rich brown loams contributed to the region’s famed fertility. Between the tenth and ninth centuries B.C. the Vannic community became the nucleus of a confederacy of mountain tribes forming the kingdom of Urartu,[232] which extended to the heads of the valleys debouching on Assyrian territory.[233] After successful resistance against Assyria the independence of the Armenian state became well established about 800 B.C.