Question: Where is Lensk located?

Context paragraphs:
Innyaly: Innyaly (Russian: Иннялы ) is a rural locality (a "selo") in Tolonsky Rural Okrug of Lensky District in the Sakha Republic, Russia, located 336 km from Lensk, the administrative center of the district and 30 km from Tolon, the administrative center of the rural okrug.  Its population as of the 2002 Census was 169.

Lensk: Lensk (Russian: Ленск ; ] ; Yakut: Лиэнскэй , "Lienskey") is a town and the administrative center of Lensky District of the Sakha Republic, Russia, located on the left bank of the Lena River, approximately 840 km west of Yakutsk, the capital of the republic.  As of the 2010 Census, its population was 24,966.

Khamra: Khamra (Russian: Хамра ) is a rural locality (a "selo") in Yaroslavsky Rural Okrug of Lensky District in the Sakha Republic, Russia, located 85 km from Lensk, the administrative center of the district, and 18 km from Yaroslavsky, the administrative center of the rural okrug.  Its population as of the 2002 Census was 182.

Tolon, Lensky District, Sakha Republic: Tolon (Russian: Толон ) is a rural locality (a "selo"), the administrative centre of and one of three settlements, in addition to Alysardakh and Innyaly, in Tolonsky Rural Okrug of Lensky District in the Sakha Republic, Russia.  It is located 306 km from Lensk, the administrative center of the district.  Its population as of the 2002 Census was 250.

Lensky District, Sakha Republic: Lensky District (Russian: Ле́нский улу́с ; Yakut: Ленскэй улууһа , "Lyenskey uluuha") is an administrative and municipal district (raion, or "ulus"), one of the thirty-four in the Sakha Republic, Russia.  It is located in the southwest of the republic and borders Mirninsky District in the north, Suntarsky District in the northeast, Olyokminsky District in the east, and Irkutsk Oblast in the south and west.  The area of the district is 77000 km2 .  Its administrative center is the town of Lensk.  As of the 2010 Census, the total population of the district was 39,765, with the population of Lensk accounting for 62.8% of that number.

Alysardakh, Lensky District, Sakha Republic: Alysardakh (Russian: Алысардах ) is a rural locality (a "selo") in Tolonsky Rural Okrug of Lensky District of the Sakha Republic, Russia, located 275 km from Lensk, the administrative center of the district and 35 km from Tolon, the administrative center of the rural okrug.  Its population as of the 2002 Census was 41.

Yaroslavsky, Sakha Republic: Yaroslavsky (Russian: Яросла́вский ) is a rural locality (a "selo") and the administrative center of Yaroslavsky Rural Okrug of Lensky District in the Sakha Republic, Russia, located 103 km from Lensk, the administrative center of the district.  Its population as of the 2002 Census was 457.

Murya, Russia: Murya (Russian: Мурья ) is a rural locality (a "selo"), the administrative centre of and one of two settlements, in addition to Batamay, in Saldykelsky Rural Okrug of Lensky District in the Sakha Republic, Russia.  It is located 18 km from Lensk, the administrative center of the district.  Its population as of the 2002 Census was 233.

Yakutsk: Yakutsk (Russian: Якутск ; ] ; Yakut: Дьокуускай , "D'okuuskay", ] ) is the capital city of the Sakha Republic, Russia, located about 450 km south of the Arctic Circle.  Population:  (2010 Census) ;  (2002 Census) ;  (1989 Census)

Batamay, Lensky District, Sakha Republic: Batamay (Russian: Батамай ) is a rural locality (a "selo"), one of two settlements, in addition to Murya, the administrative centre of the Rural Okrug, in Saldykelsky Rural Okrug of Lensky District in the Sakha Republic, Russia.  It is located 36 km from Lensk, the administrative center of the district.  Its population as of the 2002 Census was 190.

Supporting paragraphs: Lensk Yakutsk
Answer: Sakha Republic