Unga ( Urga , Etmesh  ; ( Chuvash. Unka ) - the river, the left tributary of the Great Tsivilia . It flows through the Cheboksary , Krasnoarmeysky and Tsivilsky districts of Chuvashia . The length of the river is 66 km (according to other sources - 64.8 km  ) , the catchment area is 719 km²  , the density coefficient of the river network is 0.70 km / km²  .
|• Location||near the village of Mikshi-Enzey|
|• Height||above 107.8 m|
|• Location||1 km west of Ryndino Tsivilsky district|
|• Height||61.5 m|
|Water system||Bolshoy Tsivil → Volga → Caspian Sea|
|Areas||Cheboksary District , Krasnoarmeysky District , Tsivilsky District|
It has 27 tributaries, the main of them are the Morgushka , Pokshushka , Kunar  .
Local historian I.S. Dubanov notes:
The name most likely comes from Mar. ungsho "quiet, calm", which indicates the nature of the flow of the river. Presumably, the Chuvash version of Chuv . unkă “circle, ring”. Wed mar hego "loop"- Geographic names of the Chuvash Republic 
The riverbed is regulated by dams and dams created for household and drinking use  .
Water Registry Data
According to the state water register of Russia, it belongs to the Upper Volga basin district , the water management section of the river - Tsivil from source to mouth, the river sub-basin of the river - Volga from the Oka to the Kuibyshev reservoir (without the Sura basin). The river basin is (Upper) Volga to the Kuibyshev reservoir (without the Oka basin)  .
The object code in the state water register is 08010400412112100000209  .
- Surface water resources of the USSR: Hydrological knowledge. T. 12. The Lower Volga region and Western Kazakhstan. Issue 1. The Lower Volga / ed. O.M. Zubchenko. - L .: Gidrometeoizdat, 1966. - 287 p.
- Kirillov A. A. Unga, Urga, Etmesh // Electronic Chuvash Encyclopedia .
- State Water Register . Unga . textual.ru . Ministry of Environment of Russia (March 29, 2009). The appeal date was December 20, 2018. Archived March 29, 2009.
- Dubanov I.S. Geographical names of the Chuvash Republic: local lore dictionary / I. S. Dubanov. - Cheboksary: Chuvash. Prince publishing house, 2017. - p. 447. - 575 p. - ISBN 978-5-7670-2541-1 .