Costarainera (Ligurian: A Costarainea[3][4]) is a comune (municipality) in the Province of Imperia in the Italian region Liguria, located about 100 kilometres (62 mi) southwest of Genoa and about 9 kilometres (6 mi) southwest of Imperia. As of 31 December 2004, it had a population of 775 and an area of 2.4 square kilometres (0.93 sq mi).[5]
^Dizionario di toponomastica: Storia e significato dei nomi geografici italiani (in Italian). Milan: Garzanti. 1996. p. 236.
^Frisoni, Gaetano[in Italian] (1910–2002). Nomi propri di città, borghi e villaggi della Liguria del Dizionario Genovese-Italiano e Italiano-Genovese (in Italian). Genova: Nuova Editrice Genovese.
^All demographics and other statistics: Italian statistical institute Istat.