Geography
Area: North Reef diameter about 5.6 km (3.5 mi), South Reef diameter of about 4.8 km (3.0 mi). Terrain: two (atolls) on dormant volcanic seamounts.
Both Minerva Reefs are about 435 km (270 mi) southwest of the Tongatapu Group. The atolls are on a common submarine platform from 549 to 1097 meters (1800 to 3600 feet) below the surface of the sea. North Minerva is circular in shape and has a diameter of about 5.6 km (3.5 mi). There is a small sand bar around the atoll, awash at high tide, with a small entrance into the flat lagoon with a somewhat deep harbor. South Minerva is parted into The East Reef and the West Reef, both circular with a diameter of about 4.8 km (3.0 mi). Around both reefs are two small sandy cays, vegetated by low scrub and some trees. Several iron towers and platforms are reported to have stood on the atolls, along with an unused light tower on South Minerva, erected by the Americans during World War II.. Geologically, Minervan Reef is of a limestone base formed from uplifted coral formations elevated by now-dormant volcanic activity.
The climate is basically subtropical with a distinct warm period (December–April), during which the temperatures rise above 32°C (90°F), and a cooler period (May–November), with temperatures rarely rising above 27°C (80°F). The temperature increases from 23°C to 27°C (74°F to 80°F), and the annual rainfall is from 170 to 297 centimeters (67-117 in.) as one moves from Cardea in the south to the more northerly islands closer to the Equator. The mean daily humidity is 80%.
Read more about this topic: Minerva Reefs
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