Is there an academic\ethical reason for omitting place names in environmental science papers? I hope this is the right SE site for this question. To be clear, I am not asking anything about the contents of the paper, but on the practice of omitting certain information that I thought should be included for completeness and clarity.

I have been reading a paper titled: "Spatial and temporal occurrence of pharmaceuticals and illicit drugs in the aqueous environment and during wastewater treatment: New developments", which deals with measurements of drugs' concentrations in river water in the UK.

I was surprised to see no mention of the name of the river anywhere in the paper or the supplementary material. This seems on purpose, since the authors describe the river's properties that are relevant for the study, but neglect to mention which river was it.

Could it be related to some academic practice I am not aware of, or perhaps is it a safety measure to prevent mass panic among the residents of the area?
I can think of a few reasons for which it might be sensible for names to be withheld, usually relating to not attracting large numbers of the public to a place. For example, a rare bird's nesting site, an endangered seal's haul-out area, or other places of delicate ecology.

However, it would seem reasonable for the authors to make the location known to other researchers on request, as otherwise there is no way to verify or reproduce their findings.