The Sit' River is a tributary of the Mologa River

Mologa River

Mologa River is a river in Tver, Novgorod and Vologda Oblasts of Russia. It is a left tributary of the Volga River, flowing into the Rybinsk Reservoir. The river freezes up in the late October - early December and stays under the ice until April - early May....

. The river flows for 159 km (99 mi) through the Tver

Tver Oblast

Tver Oblast is a federal subject of Russia . Its administrative center is the city of Tver. From 1935 to 1990, it was named Kalinin Oblast after Mikhail Kalinin. Population: Tver Oblast is an area of lakes, such as Seliger and Brosno...

 and Yaroslavl region

Yaroslavl Oblast

Yaroslavl Oblast is a federal subject of Russia , which is located in the Central Federal District, surrounded by Tver, Moscow, Ivanovo, Vladimir, Kostroma, and Vologda Oblasts. This geographic location affords the oblast the advantages of proximity to Moscow and St. Petersburg...

s of Russia

Russia

Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 before entering the Rybinsk Reservoir

Rybinsk Reservoir

Rybinsk Reservoir , informally called the Rybinsk Sea, is a water reservoir on the Volga River and its tributaries Sheksna and Mologa, formed by Rybinsk Hydroelectric Station dam, located on the territories of Tver, Vologda, and Yaroslavl Oblasts. At the time of its construction, it was the largest...

 near the large village of Breitovo. Its average width varies from 40 to 50 metres. The river mouth is about 1500 metres wide. The drainage basin occupies some 1900 km².

The river gives its name to the bloody Battle of the Sit River

Battle of the Sit River

The Battle of the Sit River was fought in the northern part of the present-day Yaroslavl Oblast of Russia on March 4, 1238 between the Mongol Hordes of Batu Khan and the Rus' people under Grand Prince Yuri II of Vladimir-Suzdal during the Mongol invasion of Rus...

 (1238). In the Middle Age

Middle age

Middle age is the period of age beyond young adulthood but before the onset of old age. Various attempts have been made to define this age, which is around the third quarter of the average life span of human beings....

s the valley of the Sit River belonged to a branch of the princely House of Yaroslavl. The princes of the Sit', or Sitsky, joined the service of the Grand Dukes of Muscovy in the 15th century. The family survived into the 17th century and was closely related by blood to the Romanovs.

In the early 20th century the valley of the Sit River was home to the Sitskari (ru), an ethnic group of short fair-haired people speaking a Northern dialect

Northern Russian dialects

The northern Russian dialects make up one of the main groups of the Russian dialects.- Territory :* The territory of the primary formation The northern Russian dialects make up one of the main groups of the Russian dialects.- Territory :* The territory of the primary formation The northern Russian...

 of the Russian language

Russian language

Russian is a Slavic language used primarily in Russia, Belarus, Uzbekistan, Kazakhstan, Tajikistan and Kyrgyzstan. It is an unofficial but widely spoken language in Ukraine, Moldova, Latvia, Turkmenistan and Estonia and, to a lesser extent, the other countries that were once constituent republics...

. It is thought that they had an admixture of Lithuania

Lithuania

Lithuania , officially the Republic of Lithuania is a country in Northern Europe, the biggest of the three Baltic states. It is situated along the southeastern shore of the Baltic Sea, whereby to the west lie Sweden and Denmark...

n or some other Baltic

Balts

The Balts or Baltic peoples , defined as speakers of one of the Baltic languages, a branch of the Indo-European language family, are descended from a group of Indo-European tribes who settled the area between the Jutland peninsula in the west and Moscow, Oka and Volga rivers basins in the east...

ancestry.