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Oka is a great river in Russia, the biggest right confluent of the Volga. It flows through the Oblasts of Oryol, Tula, Kaluga, Moscow, Ryazan, Vladimir and Nizhny Novgorod. Its length exceeds 1500 km. by Alexey Filin — last modified March 11, 2006 at 21:20

The name of Oka is cognate to aqua, the Latin word for water, and to the name of the Aa River in Switzerland. Historically, the river gave its name to the Upper Oka Principalities, situated upstream from Tarusa. One of the largest Russian cities, Nizhny Novgorod, was founded to protect the Oka's confluence with the Volga. The Russian capital, Moscow, sits on one of the Oka's tributaries - the Moskva River.

Official site of Protvino. by Alexey Filin — last modified March 11, 2006 at 21:27

Dear friend, you are welcome to Protvino municipal server. Protvino is located in Russia, Moscow region, 20 kilometers (12 miles) from ancient Serpukhov. Protvino was found in 1960 as a settlement for builders and physicists working on the construction of a new scientific center, with a 70 GeV proton accelerator (the world record energy at that time). In 1989, Protvino acquired the status of town.