North East Lincolnshire is a unitary authority area in the ceremonial county of Lincolnshire. It borders the unitary authority of North Lincolnshire and the non-metropolitan county of Lincolnshire. The two unitary authorities and the non-metropolitan county make up the ceremonial county of Lincolnshire.
Prior to the creation of Humberside in 1974, it was part of the administrative county of Lindsey. (Prior to 1889 it was part of the "Kingdom" of Lindsey.)
North East Lincolnshire covers an area of 74.1 sq mi (191.9 km2). Its population, according to a mid-2014 estimate, was 159,800.
The North East Lincolnshire towns of Grimsby, Immingham and Cleethorpes, form the economic area known as "Greater Grimsby". The main sectors of the Greater Grimsby economy are food and drink; ports and logistics; renewable energy and chemicals and process industries. It is in transport by sea that the area has national significance. The two ports of Immingham and Grimsby, when combined, have the largest tonnage of freight of any UK port.
Wikimedia has a map of the post-1974 districts of Lincolnshire.