A British bishop is in charge of a diocese ten times the size of Britain, after being ordained as the Bishop of Laghouat in southern Algeria.

The Right Rev John MacWilliam, 68, will minister the third largest Catholic diocese in the world, a region covering 0.81 million square miles.

Laghouat, which runs from west to east from Morocco to Libya, is home to few Christians. MacWilliam’s chapel is situated in an area home to the Mozabite population, Ibadi Muslims with Berber roots, and the city’s Arab Muslims.