Aegna is an Estonian island in the Bay of Tallinn in the Baltic Sea. Administratively it is part of the city of Tallinn, the capital of Estonia and is a sub district of the Kesklinn (City center) district.
Aegna island has an area of around 3 km2, and can be found off the Viimsi peninsula, around 1.5 km NW of Rohuneeme and 14 km north of Tallinn. It has a 10 km coastline which includes two sandy beaches. The highest point of the island is about 13m above sea level.
As of 1 June 2011 Aegna had 8 permanent residents.
Aegna is a popular destination for day and camping trips, and has around 15 km of walking routes.
Historically Aegna has been used for military purposes, and military remains that can still be seen include those of a military watchtower, a large gun battery with underground tunnels, and the light railway used in its construction.
On 10 August 2005 a Copterline helicopter on Tallinn–Helsinki route crashed 3 km south of the island. All 14 people on the helicopter died.
The small ferry Juku operates to and from the island during the summer months, with support from the city of Tallinn. In the summer of 2010 the Juku was operated by Kihnu veeteed 
During the summer Tallinn-Cruises operate sightseeing tours to the island using the boat "Monica" 
The island can also be reached by boats or yachts chartered from Pirita Harbour 
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Coordinates: 59°34′50″N 24°45′28″E / 59.58056°N 24.75778°E