|Location||Masurian Lake District, Warmian-Masurian Voivodeship|
|Max. length||3.3 km|
|Surface area||6.8 km2|
|Average depth||0.6 m|
|Max. depth||3 m|
|Surface elevation||115 m|
Łuknajno [wukˈnajnɔ] (German: Lucknainer See) is a lake in the Masurian Lake District of north-eastern Poland, in Warmian-Masurian Voivodeship. It lies approximately 5 kilometres (3.1 mi) east of the town of Mikołajki, close to the north-western corner of Poland's largest lake called Śniardwy. Łuknajno covers an area of 6.8 square kilometres (2.6 sq mi), and has a maximum depth of 3 metres (9.8 ft).
The lake is the site of a nature reserve, and since 1977 has been designated a UNESCO Biosphere Reserve and a Ramsar site, in view of its importance as a breeding ground for water birds such as grebe, rail, moorhen, grey heron, bearded tit, white-tailed eagle, osprey, rust-coloured kite, cormorant and black tern. The lake is known since many decades as the habitat of the mute swan (Latin: Cygnus olor) – nesting there every year from a dozen to tens of dozen of pairs, and in time of moult arriving in numbers reaching up to 2,000 birds. The lake is part of the larger protected area known as Masurian Landscape Park.
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