Nara (Oka)

The Nara () is a river in the Moscow Oblast and Kaluga Oblast in Russia. It is a left tributary of the Oka. The length of the river is . The area of its basin is . The Nara freezes up in November–December and stays under the ice until April. The cities of Naro-Fominsk and Serpukhov are located on the Nara River.
Etymologically, the name "Nara" is of Baltic origin, a cognate of the Lithuanian "nerti" generally meaning "to dive, swim downstream" as well as "to net, crochet". This is because the area around its course was once inhabited by Eastern Galindians (Russian: "Goliadj", "голядь"), a Baltic tribe.