Swans Like Fishes (night of 11/07/2023)

Some kind of wide shallow river running down rocks from what seems cliffs. There seems to be different sections to the river - some deeper parts. Dark, brown water. There are swans in the river - cygnets just reaching maturity, resembling adult swans, but their plumage is jagged and grey. Their entrance into adulthood seems to involved some kind of ritual involving other swans. A vague feeling that this ritual is aggressive. The swans twist and turn in the deep water like fishes.
There are people here. I am here too, though do not seem to know the other people. There is also a black goose who stalks at me in an aggressive fashion, pecking my ankles. Initially alarmed, I take a step back, but realise there is nothing to be concerned about, and the goose loses interest and walks away.
I notice that some people are walking through what I thought were deeper parts of the river, but I can see the water is only a few inches deep, and it is possible to walk through.