District (pop., 2001: 39,780), central Northern Ireland.
It is bounded by the River Bann , Lake Neaghon, and the Sperrin Mountains. It was formerly part of County Londonderry but was organized as a separate district in 1973. The town of Magherafelt, originally settled as an English company (Plantation of Ulster) town, is the seat of the district and its marketing centre.