The Waianae Range is a mountain range located on the island of Oahu in Hawaii. It stretches approximately 20 miles from the northwestern coast to the southern part of the island. The range is known for its rugged terrain, steep cliffs, and lush valleys, making it a popular destination for hikers and outdoor enthusiasts. The highest peak in the Waianae Range is Ka'ala, which rises to about 4,000 feet. The area is home to diverse ecosystems, including native Hawaiian plants and wildlife. The range also plays a significant role in the island's water supply, as it captures rainfall that feeds into local streams and aquifers.