The Brunswick River /ˈbrʌnzwɪk/ is a river in northern New South Wales, Australia running through Mullumbimby and Brunswick Heads. The north arm (Marshalls Creek) runs through Ocean Shores, Billinudgel, Ocean Shores North and The Pocket. Marshalls Creek also connect to a canal in Ocean Shores North and South Golden Beach. The south arm (Simpsons Creek) runs through Brunswick Heads, Bayside and Tyagarah.
There is a lake at Tyagrah where the local Ti trees give the lake water a brown tint. This lake becomes a popular swimming hole in the summer months and is used by naturists who come down from Tyagrah Beach. The naturist area is only about 15 km before you get to Byron Bay.