Tweed River, principal river of the North Coast district, New South Wales, Australia, usually associated with the Clarence and Richmond rivers. Of its three arms, two rise in the McPherson Range and the third in the Tweed Range of the Eastern Highlands. The river flows 50 miles (80 km) east past Murwillumbah and Condong to enter the Pacific Ocean at Tweed Heads. Visited in 1823 by the explorer John Oxley, the river was named after the River Tweed of Scotland. Its valley yields sugarcane, bananas, and dairy products.