Hailar District (
Mongolian: , Cyrillic: Хайлаар дүүрэг,
Khailaar düüreg; ) is an urban
district that serves as the seat of the
prefecture-level city Hulunbuir in northeastern
Inner Mongolia,
People's Republic of China. Hulunbuir, due to its massive size, is a city in administrative terms only, being mainly grassland and rural. Hailar, therefore, is a
de facto city. Hailar can also refer to the urban area around the Hailar district, with Hulunbuir being the wider geographical region that contains the urban area.