The Waiau River is located in the Marlborough region of New Zealand's South Island. It flows approximately 80 kilometers from the Marlborough Sounds to the Pacific Ocean, providing a vital waterway for the surrounding ecosystems and communities. The river is known for its scenic beauty, featuring clear waters and lush vegetation along its banks. It is popular for recreational activities such as fishing, kayaking, and hiking, attracting both locals and tourists who appreciate its natural charm and outdoor opportunities.