What is "tjornin"

Tjörnin (, The Pond) is a prominent small lake in central Reykjavík, the capital of Iceland. Most visitors to the city pass along its shore, as it is situated in the city centre next to the Reykjavik City Hall and several museums. Tjörnin means "the lake" or "the pond". Tarn, meaning "mountain lake", is a northern English dialect word derived from the Norse word tjörn and its genitive/plural tjarnar. Bird feeding on the lake shore, a popular pastime, has led to the lake being called "the biggest bread soup in the world" (stærsta brauðsúpa í heimi). Tjörnin was the setting for scenes in the 2010 Icelandic movie Gauragangur.