The Neglinnaya River is a 7.5-km long underground river in the central part of Moscow and a tributary of the Moskva River. It flows in the tunnels under Samotechnaya Street, Tsvetnoy Boulevard, Neglinnaya Street and Alexander Garden and Zaryadye. Neglinnaya discharges into Moskva River in two separate tunnels near Bolshoy Kamenny Bridge and Bolshoy Moskvoretsky Bridge.
