| En Name: | Ust-Yansky District |
| Ru Name: | Усть-Янский улус |
| Loc Name1: | Усуйаана улууһа |
| Loc Lang1: | Sakha |
| Image View: | Затон - panoramio (3).jpg |
| Image Coa: | Coat of Arms of Ust-Yansky rayon (Yakutia).png |
| Federal Subject: | Sakha Republic |
| Adm Data As Of: | June 2009 |
| Adm Ctr Type: | settlement |
| Adm Ctr Name: | Deputatsky |
| Urban-Type Settlement Of District Significance Type: | Settlements |
| No Of Urban-Type Settlements Of District Significance: | 3 |
| Selsoviet Type1: | Rural okrugs |
| No Of Selsoviets Type1: | 7 |
| No Of Urban-Type Settlements: | 3 |
| No Of Rural Localities: | 7 |
| Mun Data As Of: | December 2008 |
| Mun Formation1: | Ust-Yansky Municipal District |
| Mun Formation1 No Of Urban Settlements: | 3 |
| Mun Formation1 No Of Rural Settlements: | 7 |
| Mun Formation1 Counts Ref: | [1] |
| Area As Of: | June 2009 |
| Area Km2: | 120300 |
| Pop 2010Census: | 8056 |
| Urban Pop 2010Census: | 54.0% |
| Rural Pop 2010Census: | 46.0% |
| Established Date: | January 5, 1967 |
| Website: | https://mr-ust-janskij.sakha.gov.ru/ |
| Date: | April 2013 |
Ust-Yansky District (Russian: Усть-Я́нский улу́с; Yakut: Усуйаана улууһа, Usuyaana uluuha, pronounced as /usujaːna uluːha/) is an administrative[2] and municipal[3] district (raion, or ulus), one of the thirty-four in the Sakha Republic, Russia. It is located in the north of the republic in the Yana River delta on the coast of the Laptev Sea and borders with Allaikhovsky and Abyysky Districts in the east, Momsky District in the south, Verkhoyansky District in the southwest, and with Bulunsky District in the west. The area of the district is 120300km2.[4] Its administrative center is the urban locality (a settlement) of Deputatsky. Population: The population of Deputatsky accounts for 37.0% of the district's total population.
The main rivers in the district include the Yana, the Omoloy with the Ulakhan-Kyuegyulyur, the Sellyakh, as well as the Chondon with its tributary the Nuchcha. The Kyundyulyun, northernmost spur of the Chersky Range, rises north of Ust-Kuyga. There are numerous lakes in the district. Orotko is one of the largest.[5] [6] [7]
Average January temperature ranges from -32C-40C and average July temperature ranges from 4C12C.[8] Annual precipitation ranges from 150mm200mm in the north to 250mm300mm in the south.
The district was established on January 5, 1967.
As of the 1989 Census, the district had a population of 41,265 inhabitants, with an ethnic composition as follows:
58.7%
8.7%
2.2%
0.1%
However, a great deal of the ethnic Russian population left with the economic downturn following the collapse of the Soviet Union, so much so that the district lost over three-quarters of its population during the 1990s.
In the 2021 census, the indigenous Yakuts again formed a majority of inhabitants, with the total population now just 6,810. In that year, the ethnic composition of the district was:[9]
2.8%
2.7%
The main industries are gold mining, reindeer herding, fishing, and fur trade. There are deposits of gold, tin, tungsten, mercury, lead, zinc, and brown coal.
| Urban settlements | Population | Male | Female | Inhabited localities in jurisdiction | |
|---|---|---|---|---|---|
| Deputatsky (Russian: Депутатский) | 2983 | 1447 (48.5%) | 1536 (51.5%) |
| |
| Nizhneyansk (Russian: Нижнеянск) | 391 | 208 (53.2%) | 183 (46.8%) | ||
| Ust-Kuyga (Russian: Усть-Куйга) | 979 | 516 (52.7%) | 463 (47.3%) | ||
| Rural settlements | Population | Male | Female | Rural localities in jurisdiction* | |
| Kazachinsky National Nasleg (Russian: Казачинский национальный наслег) | 1367 | 665 (48.6%) | 702 (51.4%) |
| |
| Omoloysysky National Nasleg (Russian: Омолойский национальный наслег) | 433 | 223 (51.5%) | 210 (48.5%) |
| |
| Silyannyakhsky National Nasleg (Russian: Силянняхский национальный наслег) | 771 | 377 (48.9%) | 394 (51.1%) |
| |
| Tumatsky National Nasleg (Russian: Туматский национальный наслег) | 533 | 286 (53.7%) | 247 (46.3%) |
| |
| Ust-Yansky National Nasleg (Russian: Усть-Янский национальный наслег) | 317 | 166 (52.4%) | 151 (47.6%) |
| |
| Uyandinsky National Nasleg (Russian: Уяндинский национальный наслег) | 154 | 84 (54.5%) | 70 (45.5%) |
| |
| Yukagir National (Nomadic) Nasleg (Russian: Юкагирский национальный кочевой наслег) | 128 | 67 (52.3%) | 61 (47.7%) |
|
