The (Roman Catholic) Diocese of Moramanga (Dioecesis Moramanganus) is located in the east of Madagascar.
It is a suffragan diocese of the Ecclesiastical Province of the Archdiocese of Toamasina.
The cathedral of the diocese is the Sacred Heart of Jesus church in Moramanga.
The diocese covers an area of 12,064 km2, and borders the diocese of Ambatondrazaka to the north, the archdiocese of Toamasina to the east and south, and the archdiocese of Antananarivo to the west.
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