We found them to be one river.

Without knowing it, Mr.Dawes and myself had passed Richmond Hill almost a year before (in August 1790), and from there walked on the bank of the river to the spot where my discovery of the Nepean happened, in June 1789.

Our ignorance arose from having never before seen the hill, and from the erroneous position assigned to it by those who had been in the boats up the river.
Except the behaviour of some natives whom we met on the river, which it would be ingratitude to pass in silence, nothing particularly worthy of notice occurred on this expedition.
When we had reached within two miles of Richmond Hill, we heard a native call.

We directly answered him and conversed across the river for some time.

At length he launched his canoe and crossed to us without distrust or hesitation.