Each day that carried him farther southward filled him with fiercer impatience. Doubts never assailed him. As he believed in the rise and set of the sun he believed that a priest of Set had stolen the Heart of Ahriman. And where would a priest of Set carry it but to Stygia? The blacks sensed his eagerness, and toiled as they had never toiled under the lash, though ignorant of his goal. They anticipated a red career of pillage and plunder and were content. The men of the southern isles knew no other trade; and the Kushites of the crew joined whole-heartedly in the prospect of looting their own people, with the callousness of their race. Blood-ties meant little; a victorious chieftain and personal gain everything. Soon the character of the coastline changed. No longer they sailed past steep cliffs with blue hills marching behind them. Now the shore was the edge of broad meadowlands which barely rose above the water's edge and swept away and away into the hazy distance. Here were few harbors and fewer ports, but the green plain was dotted with the cities of the Shemites; green sea, lapping the rim of the green plains, and the ziggurats of the cities gleaming whitely in the sun, some small in the distance. Through the grazing-lands moved the herds of cattle, and squat, broad riders with cylindrical helmets and curled blue-black beards, with bows in their hands. This was the shore of the lands of Shem, where there was no law save as each city-state could enforce its own. Far to the eastward, Conan knew, the meadowlands gave way to desert, where there were no cities and the nomadic tribes roamed unhindered. Still as they plied southward, past the changeless panorama of city-dotted meadowland, at last the scenery again began to alter. Clumps of tamarind appeared, the palm groves grew denser. The shoreline became more broken, a marching rampart of green fronds and trees, and behind them rose bare, sandy hills. Streams poured into the sea, and along their moist banks vegetation grew thick and of vast variety. So at last they passed the mouth of a broad river that mingled its flow with the ocean, and saw the great black walls and towers of Khemi rise against the southern horizon. The river was the Styx, the real border of Stygia. Khemi was Stygia's greatest port, and at that time her most important city. The king dwelt at more ancient Luxur, but in Khemi reigned the priestcraft; though men said the center of their dark religion lay far inland, in a mysterious, deserted city near the bank of the Styx. This river, springing from some nameless source far in the unknown lands south of Stygia, ran northward for a thousand miles before it turned and flowed westward for some hundreds of miles, to empty at last into the ocean.