Baz, from Qld Gov. 'Tidal and non-tidal matters.
(3)Subsections (1) and (2) apply even if a person owns land having tidal boundaries or right line tidal boundaries on both sides of water subject to tidal influence.
Example—
A person owns land that has as its northern boundary a tidal boundary that is located on the southern edge of a river. The same person also owns land in the same locality that has as its southern boundary a tidal boundary located on the northern edge of the same river. The ownership of land on both sides of the river does not in these circumstances confer on the person ownership of the river itself.
(4)To remove any doubt, it is declared that, before the commencement of this section, if a boundary of land (the 
relevant land) was formed by high-water mark—(a)other land that adjoined the boundary and was below high-water mark was, and always was, the property of the State, unless it was inundated land or a registered interest in the land was held by someone else; and
(b)if the line of the high-water mark shifted over time by gradual and imperceptible degrees, the shift was a shift in the boundary of the relevant land.
 
				
			
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