But this interlacing of land and water, that brought the insinuating “call of the sea,” was not the only factor that predetermined the character of the Greek cantons. The Greeks were mountaineers as well as mariners. One is, indeed, almost tempted to speak of Greece as consisting of only mountains and _marina_. There are of course some relatively large plains, notably the fertile granary of Thessaly, but the general impression of the land from any bird’s-eye view is a succession of lofty ridges, peaks, and spurs. Only by many shiftings of the place of outlook do these partially resolve themselves into ranges continuous in certain general directions, though with many sharp angles and curves and buttressed by uncompromising cross ridges. These mountain barriers make clear the history of the Greek peoples, both how they combined temporarily to resist foreign invasion and, above all, why they developed and cherished in tiny cantons their characteristic individualism, which has been by turns a bane and a blessing. Thessaly and Mount Olympus to the north belong geographically to the Kingdom of Greece. On either side of Thessaly irregular mountain chains run southward and preserve a general connection through Central Greece and Attica, and, despite the submerging water, may be identified as reappearing in the islands far out in the Ægean. Olympus on the northeast—hardly interrupted by the river Peneius, which has rent its way through the precipitous cañon known as the “Vale” of Tempe—is continued along the east coast by Mount Ossa and Mount Pelion. Then across the narrow entrance to the Pagasæan and Malian gulfs the system is continued by the sharp dorsal fins of the island of Eubœa, that stretches like a sea-monster along the shores of Locris, Bœotia, and Attica, to reappear at intervals far to the southeast in the islands Andros, Tenos, Myconos, Delos, Naxos, Amorgos, and Astypalæa. On the west of Thessaly the great Pindus ridge, descending through the centre of northern Greece, details on the rugged system of peaks and ranges which fill central Greece southward to the Gulf of Corinth and which in general run from west to east. One of these ranges, called the Othrys Mountains, bounds the Thessalian countries on the south and ends at the Gulf of Pagasæ. Another, Mount Œta, is continued by the high mountains that shut off Thermopylæ to the north and runs on as the boundary between Locris and Bœotia. Still another range, running out of the central complex, has its culmination in Parnassus, 8070 feet high, and is continued, though more interrupted and with a more irregular course, by Mount Helicon in Bœotia and the frontier hills of Attica, from Helicon to Parnes, and bends around into the massive ridge of Mount Pentelicus, from whose summit the spectator can see the prolongation in the islands of Ceos, Cythnos, Seriphos, and others beyond.