A hiker’s journey over the Koolau Mountain trails

The Koolau mountain range, as majestic as it appears today, ascending skyward like a verdant curtain of green on Oahu’s Windward Coast, looked very different just 500,000 years ago. Then the western half of a million-years-extinct massive caldera—which extended eight miles between modern-day Kaneohe and Waimanalo, and four miles east to Kailua’s Mokulua islets—the range...

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