Luumäki is a municipality of Finland. The municipalities (kunta in Finnish, kommun in Swedish) represent the local level of self government in Finland and also act as the basic regional administrative units of the country. ...

It is located in the province of Southern Finland and is part of the South Karelia region. The municipality has a population of 5,299 (2003) and covers an area of 859.83 km² of which 111.52 km² is water. The population density is 6.2 inhabitants per km². Finland consists of 6 provinces (Finnish: läänit, Swedish: län), following a 1997 redesign that reduced their number from 12. ... The Province of Southern Finland is a province of Finland. ... The Region of South Karelia is a region (maakunta / landskap) of Finland. ... Finland is divided into 20 regions (maakunta/landskap in Finnish/Swedish). ... 2003 is a common year starting on Wednesday of the Gregorian calendar. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ...

The municipality is unilingually Finnish.