The Kağıthane-Piyalepaşa Tunnel (Turkish: Kağıthane-Piyalepaşa Tüneli) is a twin-tube road tunnel under the inner city of Istanbul Turkey connecting the Kağıthane district and Piyalepaşa Boulevard in Beyoğlu district. Opened in 2009 it is 3186 m (10453 ft) long.The tunnel is part of a project of the Istanbul Metropolitan Municipality to build seven tunnels for the City of Seven Hills which is the nickname of Istanbul.
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