The district is located southeast of
Hanover, and the northernmost parts border the Hanover metropolitan area. The northern half of the district is highly urbanised, while the south is covered with forests. The River
Leine enters the district in the south, runs through the towns of Alfeld and Gronau and leaves in the northwest towards Hanover; a small affluent, the
Innerste, joins the Leine from the east after flowing through the city of Hildesheim. Between Leine and Innerste there are the forested hill chains of the
Hildesheim Forest (
Hildesheimer Wald) and the
Sieben Berge ("Seven Hills", see
Alfeld for more details). ==Coat of arms==