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.
The strait has been suggested to be the location of the Battle of the Iron Gate which took place in 1032 between the Estonians and Novgorodians led by Ulf Ragvaldsson.
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It's been known as a point for pirates to ambush the Novgorodian merchant ships which brought valuable goods to Tallinn.