Yauza River is a confluent of the Moskva River, the second in size river in Moscow (after the Moskva River). 48 km length. Flows from the swamps near the north-east border of Moscow.
The system is almost entirely built underground, although some lines (1, 2, 4) cross the Moskva river[?] and line 1 also the Yauzariver on a bridge.
The first line opened on 15 May 1935 between Sokol'niki and Park Kul'tury with a branch to Smolenskaya which reached Kievskaya in April 1937 (crossing Moskva river[?] on a bridge).
The projects of the third stage of the Moscow metro were delayed during the World War II.
The Moskva River is connected to the Volga to the north by a canal built in 1937.
It was sheltered to a considerable extent by the surrounding forests and by the swamps of the Oka River to the east.
Such rivers as the Volga, Oka, Don, Dnepr, and Western Dvina were major means of trade and communication in early Russia, and Moscow was close to the headwaters of all these rivers.