The Waipi'o River is located on the Big Island of Hawaii. It flows through the lush Waipi'o 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 an important water source for the valley. The river is also significant in Hawaiian culture and history. It was once home to Hawaiian royalty and is surrounded by steep cliffs and tropical vegetation. The area attracts visitors for its natural beauty and opportunities for hiking, kayaking, and exploring the unique ecosystem of the valley.