Native name: Pulau Jerejak | |
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| Geography | |
| Location | Penang Strait |
| Coordinates | 5°19′31.9872″N 100°19′25.575″E / 5.325552000°N 100.32377083°E |
| Area | 3.62 km2 (1.40 sq mi) |
| Administration | |
| State |  Penang |
| City |  George Town |
| District | Northeast |
| Mukim | Paya Terubong |
Jerejak Island is a 3.62 km2 (362 ha) islet off the eastern coast of Penang Island in the Malaysian state of Penang. It is also a short ferry ride from Bayan Lepas, a suburb of George Town. It was formerly the main leper asylum for the Straits Settlements (1868), a Quarantine Station (1875) and a penal colony (1969).