The Roman Cassiope is sited on the North-Western edge of the island, where the modern village of Cassiope is sited. The location is on the naval route leading from West to East and vice versa and in the entrance of the Strait of Kerkyra. It is only 7 miles far from the opposite Illyrian coasts, so it was close to another important route, land-road in fact, Egnatia Road, that united all important roman cities of Greek and Albanian territory. Apart from that, the road leading from Phoenice (Φοινίκη) to the port of Onchesmos (Ογχησμός, modern Sarande, Albania), thus connecting the Strait with the mainland of ancient Epirus, must have played an important role.
In Cassiope, there are two natural harbours on either part of the peninsula; they were harbours of the closed type, thus offering shelter from both bad weather conditions and hostile attacks to the vessels. On the contrary the harbour of Onchesmus is of the open type, and Northern Epirus coasts are without any natural port. Cassiope is practically the first safe anchorage a ship may find after having sailed in the open Adriatic Sea. The two ports of Cassiope are deep enough and may host ships of big size. In addition, the plain which is in continuity of the ports, is appropriate to the storage of merchandise, and also to developing commercial-naval installations and a village.
Cassiope, was more appropriate than other natural harbours of North-Western Kerkyra. The entire area is rich in two important materials: limestone and wood. The first is abundantly found in the western side of Mount Pantokrator, and 5 quarries are mentioned in the 19th cent., so there existed materials for the construction of fortifications and the Roman buildings of the town. Wood, also abundant on the mountain, was useful both for heating and ship building. Water supply to the town was easy, mainly based on wells, helped by the frequent rains; the area was famous for its sweet waters till now days.