| Hangul: | 나각 |
| Hanja: | 螺角 |
| Rr: | nagak |
| Mr: | nagak |
The nagak (; also called na, sora, or godong) is a wind-instrument made from a large seashell and played as a horn in Korean traditional music. It produces only a single tone and is used primarily in the military procession music called daechwita. The mouthpiece of the nagak is made by making a hole in the pointed end of the conch,[1] into which a mouthpiece is fitted.[2] This instrument is first recorded as being used in Goryeo.[3]
As the instrument is from organic animals, it can vary in size. The shells were sometimes decorated with cloth or paint.