Geography
The four islands compose a total land mass of 2.67 km². Due to the atoll's tilt, much of the reef on the southeast portion has subsided. But even though it does not have an encircling reef crest, the reef crest on the northwest portion of the atoll does provide for a shallow lagoon, with depths ranging from 3–10 m (9.8–33 ft).
| Island | Original Size 1942 (ha) |
Final Size 1964 (ha) |
|---|---|---|
| Johnston Island | 19 | 241 |
| Sand Island | 4 | 9 |
| North (Akau) Island | - | 10 |
| East (Hikina) Island | - | 7 |
| Johnston Atoll | 23 | 267 |
| Lagoon | 13,000 | 13,000 |
Its climate is tropical but generally dry. Northeast trade winds are consistent and there is little seasonal temperature variation. With elevation ranging from sea level to 5 m (16 ft) at Summit Peak, the islands contain some low-growing vegetation on mostly flat terrain and no natural fresh water resources.
Read more about this topic: Johnston Atoll
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