Hammarby Sjö is a watercourse

Watercourse

A watercourse is any flowing body of water. These include rivers, streams, anabranches, and so forth.-See also:* physical geography* Environmental flow* Waterway* Hydrology* Wadi-External links:...

 in central Stockholm

Stockholm

Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...

, Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

. Separating Stockholm City Centre

Stockholm City Centre

Stockholm City Centre is the city centre of Stockholm in Sweden. The entire city of Stockholm is also the centre of the Stockholm Metropolitan Area....

 from South Stockholm

South Stockholm

Söderort is the southern suburban part of Stockholm Municipality, Sweden...

, or, more locally, Norra Hammarbyhamnen on eastern Södermalm

Södermalm

Södermalm, often shortened to "Söder", is a district in central Stockholm. It covers the large island formerly called "Åsön". With a population of 99,685, it is one of the most densely populated districts of Scandinavia...

 from Södra Hammarbyhamnen, it connects Saltsjön

Saltsjön

Saltsjön is a bay of the Baltic Sea that extends from Stockholm archipelago to the inner city of Stockholm. Its innermost part reaches the eastern shore of Gamla stan at Skeppsbrokajen. It is navigable for large craft and the major ferry lines to and from Stockholm pass through it...

 to Årstasjön.

Covering a surface of 34 hectare

Hectare

The hectare is a metric unit of area defined as 10,000 square metres , and primarily used in the measurement of land. In 1795, when the metric system was introduced, the are was defined as being 100 square metres and the hectare was thus 100 ares or 1/100 km2...

 and having an average depth of 4,5 metres (maximum 6 metres), Hammarby Sjö is supplied by a drainage area covering 159 hectares and contains 1,600,000 cubic metres of water. Originally a lake about 3 metres deep, it was transformed into a canal when connected to Saltsjön in the 1920s and a 6 metres deep channel was dug between Hammarbyslussen and Saltsjön and another to Sickla sluss. The importance of the water expanse has grown since the late 20th century as new residential areas have been constructed along its shores.

Four bridges stretch over Hammarby Sjö and connected bodies of water: Danviksbron, Skansbron

Skansbron

Skansbron is a bascule bridge in central Stockholm, Sweden. Stretching over the canal Hammarbykanalen, it connects the major island Södermalm to the southern mainland district Södra Hammarbyhamnen....

, Skanstullsbron

Skanstullsbron

Skanstullsbron is a bridge in central Stockholm, Sweden. Overpassing the older bridge Skansbron, it connects the major island Södermalm to the southern district Johanneshov....

 and Johanneshovsbron

Johanneshovsbron

Johanneshovsbron is a 756 metres long and 17,9 metres wide motorway bridge in central Stockholm, Sweden. Overpassing two older bridges, Skansbron and Skanstullsbron, and one newer bridge, Fredriksdalsbron, it connects Södermalm and the tunnel passing under it, Söderledstunneln, to Johanneshov, the...

.