Antsiranana, named Diego-Suarez prior to 1975, is a city in the far north of Madagascar. Antsiranana is the capital of Diana Region. It had an es…Antsiranana, named Diego-Suarez prior to 1975, is a city in the far north of Madagascar. Antsiranana is the capital of Diana Region. It had an estimated population of 115,015 in 2013.