Original: The Hassan II Mosque ( ) , located in Casablanca is the largest mosque in Morocco and the third largest mosque in the world after the Masjid al-Haram ( Grand Mosque ) of Mecca and the Al-Masjid al-Nabawi ( Prophet 's Mosque ) in Medina .
Simplified: It is the largest mosque in Morocco and the third largest mosque in the world after ( i ) the Masjid al-Haram ( Grand Mosque ) of Mecca and ( ii ) the Al-Masjid al-Nabawi ( Prophet 's Mosque ) in Medina .