History of the Peloponnesian War

On the side toward the Triballi, who also are independent, the boundary is formed by the Treres and Tilataeans; and these dwell to the north of Mount Scombrus and extend toward the west as far as the river Oscius.[*](Now Isker.)This river has its source in the same mountains as the Nestus[*](Now Masta.) and the Hebrus[*](Now Maritza.)-a mountain range of great extent and uninhabited that is adjacent to Rhodope.

Now the empire of the Odrysians[*](Coinciding in the main with modern Bulgaria.) in respect to its size extended along the sea-coast from the city of Abdera to the Euxine Sea as far as the river Ister. This stretch of coast constitutes a voyage for a merchant-vessel, if the shortest course is taken and the wind keeps steady astern, of four days and as many nights; but the journey by land from Abdera to the Ister can be accomplished by an active man, taking the shortest route, in eleven days.

Such was its extent on its seaboard; but inland the distance from Byzantium to the Laeaeans and the river Strymon-for this was its inland point farthest distant from the sea—it is possible for an active man to cover in thirteen days.