▁and ▁sea ▁in ▁a ▁map ▁form . ▁Unfortunately , ▁any ▁definite ▁ge ographical ▁knowledge ▁that ▁he ▁included ▁in ▁his ▁map ▁is ▁lost ▁as ▁well . ▁ ▁Although ▁the ▁map ▁has ▁not ▁surv ived , ▁H ec ata eus ▁of ▁M ile t us ▁( 5 5 0 – 4 7 5 ▁BC ) ▁produced ▁another ▁map ▁fifty ▁years ▁later ▁that ▁he ▁claimed ▁was ▁an ▁improved ▁version ▁of ▁the ▁map ▁of ▁his ▁ill ust ri ous ▁prede cess or . ▁▁▁ ▁H ec at æ us ' s ▁map ▁describes ▁the ▁earth ▁as ▁a ▁circular ▁plate ▁with ▁an ▁enc ir cling ▁Ocean ▁and ▁Greece ▁in ▁the ▁centre ▁of ▁the ▁world . ▁This ▁was ▁a ▁very ▁popular ▁contemporary ▁Greek ▁world view , ▁derived ▁originally ▁from ▁the ▁H omer ic ▁po ems . ▁Also , ▁similar ▁to ▁many ▁other ▁early ▁maps ▁in ▁anti qu ity ▁his ▁map ▁has ▁no ▁scale . ▁As ▁units ▁of ▁measurements , ▁this ▁map ▁used ▁" days ▁of ▁sail ing " ▁on ▁the ▁sea ▁and ▁" days ▁of ▁march ing " ▁on ▁dry ▁land . ▁The ▁purpose ▁of ▁this ▁map ▁was ▁to ▁accomp any ▁H ec at æ us ' s ▁ge ographical ▁work ▁that ▁was ▁called ▁Period os ▁Ges , ▁or ▁ ▁J our ney ▁Round ▁the ▁World . ▁Period os ▁Ges ▁was ▁divided ▁into ▁two ▁books , ▁" Europe " ▁and ▁" As ia ", ▁with ▁the ▁latter ▁including ▁Lib ya , ▁the ▁name ▁of ▁which ▁was ▁an ▁ancient ▁term ▁for ▁all ▁of ▁the ▁known ▁Africa . ▁ ▁The ▁work