“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 (gullies) that radiate through the island. It enables messages to be exchanged over a distance of up to 5 kilometres”
Wonderful that a whistling language exists; doubly wonderful that somebody wrote a song about it. Especially for those of us who remember the Clangers.
Bonus; from wikipedia of course; a dialogue in Silbo Gomero.
Photo from dalagomera.com