The Waipiʻo River is located on the Big Island of Hawaii. It flows through the lush Waipiʻo Valley, which is known for its stunning scenery and rich agricultural land. The river is approximately 10 miles long and is fed by several smaller streams and waterfalls, making it a vital water source for the valley's ecosystem. The river is also significant for its cultural history, as it was once home to Hawaiian royalty. Today, the Waipiʻo Valley is a popular destination for tourists and hikers, offering opportunities for exploration and appreciation of its natural beauty and historical importance.