Koʻolau Range

The Koʻolau Range is the rugged east-side mountain range of the island of Oʻahu, Hawaii, formed as the eroded remnant of the Ko’olau shield volcano. It forms the island’s dominant windward highlands with steep cliffs and deeply incised valleys.

The range is known for its dramatic sea-facing cliffs, lush vegetation on the windward slopes, and numerous hiking routes and lookouts visited for scenery and ridge-top views. The highest summits in the range reach roughly 960 metres and include Mount Konahuanui.

The landforms are the product of volcanic construction followed by large-scale flank collapse and long-term erosion, which produced the steep escarpments and narrow ridges visible today.

Geographically, the Koʻolau Range runs along Oʻahu’s eastern side, separating the windward towns such as Kailua and Kānāwai from the island’s leeward plains and the urban corridor that includes Honolulu.

• Geological origin: The range is the eroded remnant of the Ko'olau Shield Volcano; steep windward cliffs and deep valleys are a result of collapse and erosion over geological time.
• Visitor safety: Many hiking routes on the windward slopes are steep and can be wet and slippery after rain; hikers should check local conditions and trail advisories before setting out.

What to See #

• Mount Konahuanui: Mount Konahuanui is the range's highest summit, rising to roughly 960 metres and forming one of the largest accessible peaks in the Ko'olau massif.
• Nuʻuanu Pali Lookout: Nuʻuanu Pali and adjacent lookouts that provide widely used roadside viewpoints offering panoramic views of the windward side and the Koolau cliffs.