Neither of these explorers appear to have discovered the river's mouth.

On this occasion Sturt discovered the province or colony of South Australia, which in 1837 was proclaimed by the British Government, and in that colony Sturt afterwards made his home.
Sturt's third and final expedition was from the colony of South Australia into Central Australia, in 1843-1845.

This was the first truly Central Australian expedition that had yet been despatched, although in 1841 Edward Eyre had attempted the same arduous enterprise.

Of this I shall write anon.

On his third expedition Sturt discovered the Barrier, the Grey, and the Stokes ranges, and among numerous smaller watercourses he found and named Strezletki's, Cooper's, and Eyre's Creeks.