The Reef Islands are a group of 16 islands that lie to the north of the Santa Cruz Islands in the south east of the island nation of the Solomon Islands. The islands are also known by its historical name of Swallow Islands or Matema Islands. On the Reef Islands in 1999 lived about 5484 people.
The islands are located about 80 km north of Nendo, the largest island of Santa Cruz Islands.
At the Reef Islands, the main group, with the islands:
- Grimbanga Temoa
- Designating Grimbanga
- Matema Iceland
- Pigeon Iceland
Numa Miombilou or the " Big Riff ", a 10-km long shoal, 25 km west of Nifiloli is located and from the four smaller coral reefs:
- Malani Reef
Is formed. Separate from these two groups are the so-called Outer Islands:
- Nalongo and Nupani 75 km northwest of the main islands located away
- Nukapu, 35 km northwest of the main islands located away
- Makalom, 17 km north-west of the main islands located away
- Pileni, 9 km northwest of the main islands located away
- Patteson Shoal, 100km from the main islands located away
Most inhabitants of the groups speaking the Polynesian dialect Äiwoo. The inhabitants speak the dialect sub Pileni On Pileni, Matema, Nupani, Nukapu.