Meilogu
Meilogu is a geographical, cultural and natural region located in the northern part of Sardinia, in the province of Sassari, which can be considered a sub-region of Logudoro. It borders to the north with the Sardinian sub-regions of Sassarese, to the east of Montacuto, to the south of the Goceano and Marghine and to the west of the Planargia. Bonorva is the main municipality in the territory. Morphology 
The territory of Meilogu is mainly volcanic and the cinder cones make it unique in the context of a geologically ancient land, so much so that the Italian soldier and naturalist Alberto La Marmora had called it Sardinian Auvergne. Its soils are therefore among the most fertile of the island. References

Bibliography
 G. Deriu, L'insediamento umano medioevale nella curatoria di "Costa de Addes" (Comuni di Bonorva e Semestene), Sassari, Magnum, 2000 
 S. Ginesu, I vulcani del Logudoro-Mejlogu, Sassari, 1992. Alberto La Marmora, Itinéraire de l'ile de Sardaigne, Turin, 1860. Alberto La Marmora, Voyage en Sardaigne ou Description statistique, physique et politique de cette ile, avec des recherches sur ses productions naturelles, et ses antiquités. Bertrand, Paris, Bocca, Turin, 1826. Geography of Sardinia
Geographical, historical and cultural regions of Italy
Blue zones
Natural regions of Europe
History of Sardinia