Which unusual wind instrument consists of a long, thin tube, often more than 8 feet in length, with an open bowl at the end?

The Alphorn is a traditional Swiss wooden horn that can be over 12 feet long with a flared, cup-shaped end (the 'bowl'). It's used in Alpine regions and has a distinctive, deep sound. The didgeridoo is Australian and has no bowl end. The French horn is a brass instrument with coiled tubing. The bassoon uses a double reed and has a different shape entirely.