Swan

So I don’t no much about swans and there is a swan that has been returning to an old pier outside my flat for about a week now and was just concerned maybe it’s lost or someone could re home him/her to a better place as it a derelict beach sort of (I can send pictures to those who can help as it won’t let me attach pictures bellow) and I don’t know, usually you see swans near river and ponds etc and I’m not that far from the sea and just thought this was very strange.