Konstancin-Jeziorna [kɔnsˈtant͡ɕin jɛˈʑɔrna] is a town in Piaseczno County, Masovian Voivodeship, Poland, with 16,963 inhabitants (2011). It is located about 20 km (12 mi) south of downtown Warsaw and is a part of the metropolitan area of that city.
The town was created in 1969 through combining the two namesake towns and a number of villages.
The town, a 19th-century health spa, sits on the administrative border of the capital city, Warsaw. The town has an interesting collection of historic villas and new built mansions, a shopping center in a restored 19th-century mill and is the home of the American School of Warsaw.
International relations 
Twin towns – Sister cities 
Konstancin-Jeziorna is twinned with:
External links 
Coordinates: 52°05′N 21°07′E / 52.083°N 21.117°E