Adriatic Sea southeast, the Adriatic Sea connects to the Ionian Sea at the wide Strait of Otranto. The International Hydrographic Organization (IHO) defines the boundary between the Adriatic and the Ionian seas as a line running from the Butrinto River's mouth (latitude 39°44'N) in Albania to the Karagol Cape in Corfu, through this island to the Kephali Cape (these two capes are in latitude 39°45'N), and on to the Santa Maria di Leuca Cape (latitude 39°48'N). It extends from the northwest to the southeast and is wide. It covers and has a volume of . The Adriatic extends northwest from 40° to
Venetian rule in the Ionian Islands the Ionian Islands. Because of its status, Italian was also taught at schools along with Greek and English (Ionian Islands were a protectorate of the United Kingdom from 1815 until 1864). In the First Year of the secondary education, for instance, Greek was taught four times a week, Italian three times and English twice. In the Greek Census of 1907, 4,675 people from the Ionian Islands stated Catholicism as their denomination, about 1.8% of the total population (254,494), while 2,541 (1%) Ionians stated Italian as their mother tongue, making it the second language by number of speakers. The Italian language