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Photo: Michelle Spollen — Unsplash License. Source: Unsplash.

About this place ↓

About Green Ridge above the Reef, Oʻahu

Oʻahu was built by two great shield volcanoes, Waiʻanae and Koʻolau, which rose from the sea millions of years ago. Much later, short and violent eruptions near the coast added craters and ridges such as Diamond Head and Koko Head. Rain and waves have carved their slopes ever since, while coral reefs grow in the shallow water around the island, colouring the sea in every shade from turquoise to deep blue.

Puzzle tip: the dark ridge stands out against the sky and the sea, so build it first; the reef is best sorted by its shades of blue.

Location
USA, North America
Theme
Nature