Keskisaari (in Finnish ‘keski’ means middle and ‘saari’ means island) is a place name and family name in Finland.http://verkkopalvelu.vrk.fi/Nimipalvelu/default.asp?L=1 nimipalvelu There are a number of places called Keskisaari around Finland, including Lappee (Lapvesi) and Koivisto (Björkö) in Karelia and Maaninka.
Origin In Maaninka Keskisaari there is an early Iron Age burial site
Present The Koivisto Keskisaari is no longer a part of Finland since the Second World War.
References