some of the streams from the Taurus; but the larger rivers flow northward to the Black Sea. Beyond the break made by the Ægean Sea, we have the great basin of the Danube, also draining into the Black Sea; the head-streams of the Danube tributaries rise almost within sight of the Adriatic, but high on those Illyrian Uplands whose steep outer brink forms the mountain wall above the beautiful Dalmatian coast. That wall we name the Dinaric Alps.
Thus the Taurus and the Dinaric Alps present steep fronts to the Mediterranean and Adriatic, but send long rivers down to the Black Sea. But for the Ægean Sea, breaking through the uplands towards the Black Sea, and but for the Dardanelles, whose current races southward with the water of all the Black Sea rivers, these high, outward fronts of the Taurus and Dinaric Alps would be a single curving range, the edge of a continuous bar of land dividing the inner Black Sea from the outer Mediterranean and Adriatic. Were it not for the Dardanelles that edge would form the border of the Heartland, and the Black Sea and all its rivers would be added to the 'Continental' systems of drainage. When the Dardanelles are closed by land-power to the sea-power of the Mediter-
