The Waipio River is located on the Big Island of Hawaii. It flows through the lush Waipio Valley, which is known for its stunning landscapes and rich history. The river is approximately 10 miles long and is fed by several smaller streams and waterfalls, making it an important water source for the surrounding area. The Waipio Valley is also significant in Hawaiian culture, as it was once a royal residence and is home to many ancient taro fields. The river's waters eventually flow into the Pacific Ocean, contributing to the diverse ecosystem of the region.