today, each neighbourhood is identified by both a two-digit number between 01 and 59 and an official name in both finnish and swedish (in some cases they may be identical). in addition, there is an unnumbered neighbourhood called aluemeri that consists essentially only of outer coastal water that doesn't reach to the coast. neighbourhoods are further divided into quarters ("osa-alue") and sectors ("pienalue"), numbered with three and four digits respectively. sectors divide further into individual blocks and properties.