Silbo Gomero (Spanish: silbo gomero [ˈsilβo ɣoˈmeɾo], 'Gomeran whistle'), also known as el silbo ('the whistle'), is a whistled register of Spanish used by inhabitants of La Gomera in the Canary Islands to communicate across the deep ravines and narrow valleys that radiate through the island. It enables messages to be exchanged over a distance of up to 5 kilometres. Due to this loud nature, Silbo Gomero is generally used in circumstances of public communication. Messages conveyed could range from being an event invitation to being public information advisories.A speaker of Silbo Gomero is sometimes referred to in Spanish as a silbador ('whistler'). Silbo Gomero is a transposition of Spanish from speech to whistling. This oral phoneme-whistled phoneme substitution emulates Spanish phonology