Silbo Gomero, also known as el silbo, is a whistled register of Spanish that is used by inhabitants of La Gomera, in the Canary Islands. It was historically used to communicate across the deep ravines and narrow valleys that radiate through the island and enabled messages to be exchanged over a distance of up to five kilometres. Its loudness causes Silbo Gomero to be generally used for public communication. Messages that are conveyed range from event invitations to public information advisories. A speaker of Silbo Gomero is sometimes called a silbador ("whistler").