The leaves are smaller than the Victoria that shows behind the flowers in some of the pics. This waterlily has large (to 25 cm) blue-white flowers that emerge from the water. The plant is a perennial and grows from small tubers. The large circular leaves grow up to 75 cm in diameter and have toothed margins.
The Giant Waterlily is found in permanent water with deep mud in tropical and subtropical Australia. It occurs on the northern coast of NSW and up through Queensland.
National Botanical garden, Belgium. http://plantnet.rbgsyd.nsw.gov.au/cgi-bi...