Les Quatre Frères (The Four Brothers) are four rocks of silver basalt in the Mitsio Archipelago in the north-west of Madagascar. The islands are partly covered by savanna. Two of the islands are home to hundreds of seabirds, such as white-tailed tropic birds, frigate birds and brown boobies.
The four islands are:
- Nosy Beangovo (63 metres high)
- Nosy Betalinjona (76 metres high)
- Nosy Antsoha (51 metres high)
- Nosy Betanihazo (88 metres high)