The Geographica (Ancient Greek: Γεωγραφικά, Geōgraphiká), or Geography, is an encyclopedia of geographical knowledge, consisting of 17 'books', written in Greek by Strabo, an educated citizen of the Roman empire of Greek descent. Work can have begun on it no earlier than 20 BC. A first edition was published in 7 BC followed by a gap, resumption of work and a final edition no later than 23 AD in the last year of Strabo's life. Strabo probably worked on his Geography and now missing History concurrently, as the Geography contains a considerable amount of historical data. Except for parts of Book 7, it has come down to us complete.