The Seven Great Monarchies Of The Ancient Eastern World, Vol 5: Persia / The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations.

OF THE ANCIENT EASTERN WORLD; OR, THE HISTORY, GEOGRAPHY, AND ANTIQUITIES OF CHALDAEA, ASSYRIA BABYLON, MEDIA, PERSIA, PARTHIA, AND SASSANIAN, OR NEW PERSIAN EMPIRE. BY GEORGE RAWLINSON, M.A., CAMDEN PROFESSOR OF ANCIENT HISTORY IN THE UNIVERSITY OF OXFORD IN THREE VOLUMES. VOLUME II. WITH MAPS AND ILLUSTRATIONS
The geographical extent of the Fifth Monarchy was far greater than that of any one of the four which had preceded it. While Persia Proper is a comparatively narrow and poor tract, extending in its greatest length only some seven or eight degrees (less than 500 miles), the dominions of the Persian kings covered a space fifty-six degrees long, and in places more than twenty degrees wide. The boundaries of their empire were the desert of Thibet, the Sutlej, and the Indus, on the east; the Indian Sea, the Persian Gulf, the Arabian and Nubian deserts, on the south; on the west, the Greater Syrtis, the Mediterranean, the Egean, and the Strymon river; on the north, the Danube, the Black Sea, the Caucasus, the Caspian, and the Jaxartes. Within these limits lay a territory, the extent of which from east to west was little less than 3000 miles, while its width varied between 500 and 1500 miles. Its entire area was probably not less than, two millions of square miles—or more than half that of modern Europe. It was thus at least eight times as large as the Babylonian Empire at its greatest extent, and was probably more than four times as large as the Assyrian.
The provinces included within the Empire may be conveniently divided into the Central, the Western, and the Eastern. The Central are Persia Proper, Susiana, Babylonia, Assyria, Media, the coast tract of the Caspian, and Sagartia, or the Great Desert. The Western are Paeonia, Thrace, Asia Minor, Armenia, Iberia, Syria and Phoenicia, Palestine, Egypt, and the Cyrenaica. The Eastern are Hyrcania, Parthia, Aria, Chorasmia, Sogdiana, Bactria, Scythia, Gandaria, Sattagydia, India, Paricania, the Eastern AEthiopia, and Mycia.