Of the various Slavic tribes, only the Baiounitai, first attested , are known by name, giving their name to their region of settlement: "Vagenetia". Based on the density of the Slavic toponyms in Epirus, the Slavs must have settled in the region, although the extent of this settlement is unclear. Slavic toponyms occur mainly in the mountainous areas of the interior and the coasts of the Gulf of Corinth, indicative of the fact that this was the avenue used by most of the Slavs who crossed the Gulf into the Peloponnese. With the exception of some few toponyms on Corfu, the Ionian Islands seem to not have been affected by Slavic settlemet. The linguistic analysis of the toponyms reveals that they date mostly to the early wave of Slavic settlement at the turn of the 6th/7th centuries. Due to scarcity of textual evidence, it is unclear how much the area was affected by the second wave of Slavic migration, which began in the middle of the 8th century due to Bulgar pressure in the northern Balkans.