The world’s longest wind instrument is the Ukrainian trembita
The trembita is a conical tube without any side holes. Its length can reach up to 4 meters, and its diapason is two and a half octaves. They say that the sound of the trembita can be heard from over 10 kilometres.
This musical instrument has been tradition; used by the highlanders of the Ukrainian Carpathians to inform the whole of the mountain community about important events. If you occasionally visit one of the numerous festivals held Carpathians, you'll get a chance to see and hear a trembita in action for yourself.