Khentii (Mongolian: Хэнтий) is one of the 21 aimags (provinces) of Mongolia, located in the east of the country. Its capital is Chinggis City. The aimag is named after the Khentii Mountains. It is best known as the birthplace, and likely final resting place, of Temüjin, otherwise known as Genghis Khan.

The aimag borders with Russia (Zabaykalsky Krai) in the north. The neighbouring aimags are Selenge in the northwest, Töv in the west, Govisümber in the southwest, Dornogovi in the south, Sükhbaatar in the southeast, and Dornod in the east. The border to Töv is divided by the city of Baganuur, an administrative exclave of Ulaanbaatar.

The northwest of the aimag is covered by the eastern part of the Khentii Mountains; towards the southeast, the landscape changes into the eastern Mongolian steppe plains. The mountain Burkhan Khaldun in the Khan Khentii Strictly Protected Area is considered sacred and assumed to be the birthplace of Genghis Khan.

The Kherlen River originates South of the Burkhan Khaldun; the river then crosses the south of the aimag in the eastern direction after a detour through Töv. A little further east is the spring of the Onon River. The Onon-Balj National Park is located in the northeast of the aimag.

Ethnic groups of Khentii aimag
national censuses data

Ethnic group	Mongolian name	1979	%	1989	%	2000	%	2010	%
Khalkha	Халх	42,883	81.21	57,391	77.76	61,363	86.49	57,072	87.35
Buriad	Буриад	6,550	12.40	7,044	9.54	6,223	8.77	5,477	8.38
Uriankhai	Урианхай	595	1.13	1,004	1.36	951	1.34	779	1.19
Kazakh	Казак (Хасаг)	1,290	2.44	3,655	4.95	629	0.89	463	0.71
Dörvöd	Дөрвөд	154	0.29	208	0.28	186	0.26	371	0.57
Dariganga	Дарьганга	177	0.34	353	0.48	361	0.51	281	0.41
Bayads	Баяд	56	0.11	185	0.25	120	0.17	117	0.18
Darkhad	Дархад	18	0.03	24	0.03	32	0.05	39	0.06
Torguud	Торгууд	37	0.07	19	0.03	16	0.02	17	0.03
Üzemchin	Үзэмчин	18	0.03	8	0.01	3	0.00	8	0.01
Other Mongolian citizens		209	0.40	161	0.22	482	0.68	467	0.71
Foreigners		816	1.55	3,752	5.08	580	0.82	244	0.37
Total		52,803	100.00	73,804	100.00	70,946	100.00	65,335	100.00

The Cities of Khentii aimag

City	Mongolian	Sum	Population (1994)	Population (2001)	Population (2006)	Population (2007)	Population (2008)	Population (2010)
Berkh	Бэрх	Batnorov	4,517	3,871	3,890	3,673	3,541	2,413
Bor-Öndör	Бор-Өндөр	Darkhan	2,695	6,406	8,510	8,932	8,902	8,080
Chinggis(capital)	Чингис	Kherlen	14,409	~12,000	~14,800	~15,000	~15,000	17,164

The Sums of Khentii aimag

Sum	Mongolian	Population (1994)	Population (2001)	Population (2005)	Population (2008)	Population (2010)	Area (km)	Density (/km)
Batnorov	Батноров	3,169	2,986	6739*	2,833	2,693	4,968	0.54
Batshireet	Батширээт	2,591	2,196	2,009	2,092	2,086	7,018	0.30
Bayan-Adarga	Баян-Адарга	2,493	2,333	2,413	2,429	2,205	3,021	0.73
Bayankhutag	Баянхутаг	2,130	2,280	2,090	1,949	1,656	6,029	0.27
Bayanmönkh	Баянмөнх	1,646	1,790	1,693	1,532	1,347	2,540	0.53
Bayan-Ovoo	Баян-Овоо	1,917	1,697	1,701	1,765	1,581	3,381	0.47
Binder	Биндэр	4,184	3,615	3,537	3,784	3,455	5,386	0.64
Dadal	Дадал	2,826	2,387	2,534	2,667	2,612	4,727	0.55
Darkhan	Дархан	1,949	1,904	9,462**	1,899	1,549	4,455	0.35
Delgerkhaan	Дэлгэрхаан	3,029	2,902	2,339	2,353	2,040	3,986	0.51
Galshar	Галшар	2,575	2,906	2,468	2,074	1,807	6,676	0.27
Jargaltkhaan	Жаргалтхаан	1,863	2,073	1,848	1,926	1,831	2,752	0.67
Kherlen ***	Хэрлэн	20,172	16,578	16,783	17,154	19,000	3,788	5.02
Mörön	Мөрөн	2,444	2,264	2,026	1,934	1,326	2,196	0.60
Norovlin	Норовлин	2,713	2,777	2,255	2,341	2,254	5,334	0.42
Ömnödelger	Өмнөдэлгэр	3,895	5,739	5,208	5,148	5,156	10,877	0.47
Tsenkhermandal	Цэнхэрмандал	2,361	1,791	1,661	1,447	2,004	3,177	0.63

- including Berkh.

- including Bor-Öndör.

- including the aimag capital Chinggis.