The historical region of Epirus is generally regarded as extending from the northern end of the Ceraunian mountains (modern Llogara in Albania), located just south of the Bay of Aulon (modern Vlorë), to the Ambracian Gulf (or Gulf of Arta) in Greece. The northern boundary of ancient Epirus is alternatively given as the mouth of the Aoös (or Vjosë) river, immediately to the north of the Bay of Vlorë. Epirus's eastern boundary is defined by the Pindus Mountains, that form the spine of mainland Greece and separate Epirus from Macedonia and Thessaly. To the west, Epirus faces the Ionian Sea. The island of Corfu is situated off the Epirote coast but is not regarded as part of Epirus.