From the Abruzzi the chain continues in a southern direction, at first undivided and of considerable height; after a depression which formsa hill-country, it splits into a somewhat flattened succession of heights towards the south-east and a more rugged chain towards the south, and in both directions terminates in the formation of narrow peninsulas.
The flat country on the north, extending between the Alps and the Apennines as far down as the Abruzzi, does not belong geographically, nor until a very late period even historically, to the southern land of mountain and hill, the Italy whose history is here to engage our attention.

It was not till the seventh century of the city that the coast-district from Sinigaglia to Rimini, and not till the eighth that the basin of the Po, became incorporated with Italy.
The ancient boundary of Italy on the north was not the Alps but the Apennines.

This mountain-system nowhere rises abruptly into a precipitous chain, but, spreading broadly over the land and enclosing many valleys and table-lands connected by easy passes, presents conditions which well adapt it to become the settlement of man.

Still more suitable in this respect are the adjacent slopes and the coast-districts on the east, south, and west.

On the east coast the plain of Apulia, shut in towards the north by the mountain-block of the Abruzzi and only broken by the steep isolated ridge of Garganus, stretches in a uniform level with but a scanty development of coast and stream.