A law of 26 June 1914, created a canton by the name of "De Osa". This new entity encompassed much of the national territory of southernmost Costa Rica.
Buenos Aires was created on 29 July 1940 by decree 185, segregated from "De Osa".[1] The remaining territorial extension is now Osa canton.
Geography
Buenos Aires has an area of 2,384.22 km2[4] and a mean elevation of 386 metres.[2]