Sea barrier

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A sea barrier is an anthropogenic structure which can fulfill different purposes: It can serve as part of a defensive structure, as a means to create a logistical choke-point for tax-collecting, or to divert currents and thus influence erosion and deposition patterns.

MA201102 32 Särkkä.jpg

An underwater defence structure at Suomenlinna Sea Fortress, Helsinki, Finland. Copyright: Finnish Heritage Agency, photo. Maija Huttunen.