In a land area of approximately 103,000 square kilometers, the diocesan territory covers the prefecture-level cities of Jiamusi and Yichun, Shuangyashan and Qitaihe in the eastern part of Heilongjiang province.
The population of Jiamusi is 2.55 million at the 2010 census, of whom 850,750 live in the urban area, covering nationalities of Han, Korean, Manchu, Hezhen , Mongol and Hui, etc.
The population of Yichun city, which also has a church, is about 1 million. Shuangyashan and Qitaihe cities have 1.5 million and 890,000 people respectively.
The Mission "Sui iuris" (or independent mission) of Ilan was erected in 1928 and was renamed Jiamusi in 1937. It was elevated to an Apostolic Prefecture in 1940. It was entrusted to the Order of Friars Minor (Franciscan) missioners.
Jiamusi Airport is located on the southern portion of the Tongjiang-Sanya Highway, 10 kilometers east of Jiamusi City. Here one can access flights to Beijing, Shanghai, Guangzhou and Harbin, as well as international flights to Khabarovsk of Russia. The railways in Jiamusi connect it with Harbin, Hegang, Mudanjiang and Shuangyashan, through which connections can be made with other cities. Highways link Jiamusi with Harbin and Tongjiang.
Jiamusi has a monsoon-influenced humid continental climate, with long, bitter, but dry winters, and humid and very warm summers. High temperatures range from 12.7 degrees Celsius in January to 27.6 degrees Celsius in July. More than 60 percent of the year's precipitation occurs from June to August.
In 2007, Jiamusi had a GDP of 34.1 billion yuan (US$5.3 billion) with a 14.3 percent growth rate.
Jiamusi is a prefecture-level city in Heilongjiang province located on the riverside of the middle and lower reaches of the Songhua River. It borders with Harbin to the west and Shuangyashan to the east. It is separated from Russia by the Wusuli River (Ussuri River) in the east and the Heilongjiang River (Amur River) in the north.
Jiamusi is home to Jiamusi University. It was established in 1947, covering 1,490,000 square meters, its buildings having a floor space of 840,130 square meters, and with 22 colleges and 1 department directly under the university. Every year, over 500 foreign students come here for long-term or short-term training programs.
Historical records list Jiamusi as an ancient bridle road of the Songhua River, leading to the Heilongjiang River estuary. It was once inhabited by the Sushen ethnic group, ancestors of the present Manchu group. There's no exact record of the origin of Jiamusi. It wasn't until the 20th Century that Jiamusi became an active town that it is now.
In addition to the Han, Mongol and Hui ethnic groups, a population of Korean, Manchu and Hezhen ethnic minorities also reside in Jiamusi. Among the four ethnic townships are two Korean (Xinghuo and Tangwang townships) and two for Hezhen (Jiejinkou and Bacha townships). Hezhen is known for its fishing culture throughout Northern China. The area's cuisine features many seafood dishes, and specialized clothing and ornaments are made of fish skin and bones.