The M1 is a motorway in Northern Ireland. It goes between Belfast and Dungannon. It then goes in the direction of Omagh and Enniskillen as the A4. The first part of the motorway is also part of the route between Belfast and Dublin (via the N1 in Northern Ireland and the M1 in the Republic of Ireland). The M1 is about long. This means it is the longest in Northern Ireland. 