Lilla Värtan

Separating mainland Stockholm from the island and municipality Lidingö, it stretches from Blockhusudden in the south to Stora Värtan in the north, and is joined by the Stocksundet mid-way.

Stationary predator fishes, e.g. northern pike and perch, are exposed to raised levels of mercury.

[1] The area is considered an important wintering location for several birds species, including swans, Eurasian coot, common pochard, tufted duck, black-headed gull, lesser black-backed gull, gadwall, and common tern.

The strait constitutes an important locale, especially ice-free winters, besides the lake Isbladskärret on Djurgården.

[1][2] Vegetation on the shore lines of Lilla Värtan includes alder, purple loosestrife, common valerian, yellow loosestrife, reed canary-grass, tall fescue, lesser periwinkle, and giant knotweed.