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Rarotonga

Island of the Cook Islands

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  • 6 chapters
Rarotonga
Unknown author · Public domain

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Rarotonga has been populated by a Polynesian people since late in the 1st millennium. Although it had been sighted earlier, Captain Theodore Walker master of the colonial schooner Cumberland is credited as the first European to land on the island in 1814.

Geography

Rarotonga is a kidney-shaped volcanic island, 32 km (20 mi) in circumference, and 11.2 km (7.0 mi) wide on its longest (east-west) axis. The island is the summit of an extinct Pliocene or Pleistocene volcano, which rises 5,000 metres (16,000 feet) from the seafloor. The island was formed between 2.3 and 1.6 million years ago, with a later stage of volcanism between 1.4 and 1.1 million years ago. While its position is consistent with being formed by the Macdonald hotspot, its age is too young, and its formation is attributed to a short-lived Rarotonga hotspot, or to rejuvenated volcanism at Aitutaki.

The core of the island consists of densely forested hills cut by deep valleys, the eroded remnants of the original volcanic cone. Te Manga, at 658 m (2,140 ft) above sea level, is the highest peak on the island. Ikurangi, a smaller peak, overlooks the capital. The hills are drained by a number of radial streams, including the Avatiu Stream and Takuvaine Stream. Paved and unpaved roads allow access to valleys, but the interior of the island remains largely unpopulated due to forbidding terrain and lack of infrastructure.

The hills are surrounded by a low coastal plain consisting of beaches, a storm ridge, lowland swamps, and alluvial deposits. This in turn is surrounded by a fringing reef, which ranges from 30 to 900 metres (98 to 2,953 feet) wide. The reef is shallow, with a maximum depth of 1.5 m (4.9 ft), and has a number of passages, notably at Avarua, Avatiu and Ngatangiia. Beyond the reef crest, the outer reef slopes steeply to deep water.

The lagoon is at its widest off the southeast coast in the area of the Muri Lagoon. This area contains four small islets or motu. From north to south, the islets are:

  1. Motutapu, 10.5 hectares (26 acres)
  2. Oneroa, 8.1 hectares (20 acres)
  3. Koromiri, 2.9 hectares (7.2 acres)
  4. Taakoka, 1.3 hectares (3.2 acres)

Another small islet, Motutoa, lies on the reef flat on the northwest coast.

A tract of 155 ha (380 acres) of land has been set aside in the south-east as the Takitumu Conservation Area to protect native birds and plants, especially the Vulnerable kakerori (Rarotonga monarch or Rarotonga flycatcher). Other threatened birds in the conservation area include the Rarotonga fruit dove and Rarotonga starling. The site has been recognised as an Important Bird Area (IBA) by BirdLife International.

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