the expression "North of the Tweed" is used to refer to the people and places of Queensland; likewise, "South of the Tweed" is a term used by Queenslanders regarding the southern states of Australia. The term probably originates from southern Australians' summer vacation trips driving along the Pacific Highway through the scenic New South Wales North Coast. The highway crosses many rivers along its route, with the Tweed being the last one before reaching the holiday destinations of the Gold Coast, just on the other side of the Queensland border. Course The river begins northwest of the village called Lillian Rock. The upper reaches pass through the small villages of Kunghur, Terragon and Uki. South of Mount Warning, Doon Doon Creek and Perch Creek enter the Tweed from its southern banks, and Byrill Creek joins on the northern side near Terragon. Downstream, Korumbyn Creek and then the Oxley River enters the river at Byangum, before it flows through Murwillumbah. At Tumbulgum, the Rous River joins the Tweed. The Terranora and Cobaki creeks enter the Tweed about upstream from the mouth. South of Banora Point, the Pacific Highway crosses the river. The river's tidal influence reaches beyond Murwillumbah to Bray Park Weir. The estuary of the Tweed River is an important shorebird habitat. Flooding During Cyclone Oswald, the Tweed River was subject to major flooding, brought about due to the storm's residual effects and associated monsoon trough that passed over parts of Queensland and New South Wales. The river peaked at , the highest level recorded in 30 years. In late March 2017 rainfall from Ex-Tropical Cyclone Debbie caused major flooding in the Tweed Valley, the Murwillumbah gauge recording a peak of 6.2 metres. Mouth There is a sand bypassing system operating at the mouth of the Tweed River. A jetty on the northern end of Letitia Spit that collects sand and then pumps it under the Tweed River to beaches in the neighbouring state of Queensland. Outlets for the Tweed River Entrance Sand Bypassing System include Duranbah Beach, Snapper Rocks East, Snapper Rocks West, Greenmount and Kirra. Dredging of the navigation entrance is also undertaken regularly as part of the overall sand bypassing program. The width of Tweed River mouth is about . The Indo-Pacific humpback dolphin reaches its southern extent of its distribution at the river mouth. See also Rivers of New South Wales List of rivers of Australia