Onoun
| Onoun | |
|---|---|
| NASA satellite picture of Onoun | |
| Country | Federated States of Micronesia | 
| State | Chuuk State | 
| Area | |
| • Land | 2.54 km2 (0.98 sq mi) | 
| Time zone | UTC+10 | 
Onoun, also known as Ulul, is the westernmost island of Namonuito Atoll and a municipality in Chuuk State, Federated States of Micronesia.