Island Existed off Bulgaria's Coast Until Middle Ages

A sizable but now destroyed and/or sunken island – likely the size of Greece's Aegean island of Thasos – existed in the Black Sea off the southern Black Sea coast of today's Bulgaria but disappeared as a result of natural calamity sometime in the Middle Ages, a report points out.

The island in question was called Cyanida (or Kianida), and is featured on maps from the 15th century based on “Geography" (also known as “Geographia" or the “Cosmographia"), a work written ca. 150 AD by 2nd century AD Greco-Roman geographer Claudius Ptolemy.

These include maps published in 1467 in the Reichenbach Monastery (today in Southern Germany) such as Ptolemy's 9th European Map (Nona Europae Tabula) (featuring Dacia (Datia), Thrace (Thracia), and Upper and Lower Moesia) and Ptolemy's 1st Asian Map (Tabula Asiae I), depicting Asia Minor / Anatolia. (The maps in question are part of the collection of the National Library in Warsaw, Poland.)

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