[1] Feeding the birds on the lake shores is a popular pastime, so much that it has been referred to as "the biggest bread soup in the world".

[1] This street, which passes through the business section of the city, lies on the southern side of the lake and leads to the gardens.

[4] The outflow from the lake is Lækurinn, previously an open water channel flowing through the city centre, but since 1911 part of the sewage system under Lækjargata.

[6] The popularity of bird feeding has led to the lake being poetically referred to as "the biggest bread soup in the world" (stærsta brauðsúpa í heimi).

[12] Lately, however, preying seagulls have caused the City Council to issue warnings to residents, asking them to refrain from feeding the ducks in Tjörnin to avoid putting ducklings at risk.

[18] Vatnsmýrin Reserve, the protected area around Tjörnin, has deteriorated in recent years as evidenced by a drop in the variety of reported birds.

Part of the issue is attributed to the lack of appropriate nesting grounds due to invasive flora species as well as the presence of animals in the reserve.