The principal rivers are the Boyana, issuing from Lake Scutari, and consequently regarded as a continuation of the Montenegrin Moratcha, the Drin, formed by the confluence of the White and Black Drin, which, flowing respectively to the south and north through a long valley at the foot of the Shar range, take a westerly direction after their junction, the Matia, the Arzen, the Shkumb (ancient Genusos), the Simen (Apsos), formed by the junction of the Devol and Ergene, the Viossa (Aous), which owing to the trend of the Khimara range takes a north-westerly direction, the Kalamas (Thyamis) and the Arta (Arachthos), flowing south into the Ambracian Gulf.
By katabothra, or underground channels, into the Ambracian Gulf.
According to another story, he returned to Argos from Troy, but, being dissatisfied with the condition of things there, left it for Acarnania, where he founded Amphilochian Argos on the Ambracian gulf.
From the Ambracian Gulf, on a bend of the navigable river Aracthus (or Aratthus), in the midst of a fertile wooded plain.
Communication by sea with Athens, Patras, the Ionian Islands and the shores of the Ambracian Gulf, is constant since the opening of the Corinthian ship canal, in 1893.
Megara, Phocis, Boeotia and Locris (which had formed part of the Athenian land empire), and the maritime colonies round the Ambracian Gulf.
Demosthenes averted this, and immediately afterwards by superior tactics inflicted a complete defeat at Olpae in Acarnania on Eurylochus at the head of a Spartan and Ambracian force.
An Ambracian reinforcement was annihilated at one of the peaks called Idomene, and a disgraceful truce was accepted by the surviving Spartan leader Menedaeus.