RYBINSK, or RUIBINSK  , a town of Russia, in the government of Yaroslavl, 6o m. by river N.W. of Yaroslavl . It is connected by rail (186 m.) with Bologoye, on the line between St Petersburg and Moscow . It derives its importance from its situation on the Volga, opposite the mouth of the Sheksna, which connects the Volga with the regions around Lake Ladoga . Rybinsk has also an active trade in agricultural products from the neighbouring districts . The permanent population, which was 25,223 in 1897, is increased in the summer by nearly 1oo,000 workers from different parts of Russia .