The day-trippers have gone home as we look north to the dark shape of Ben Lomond, etched against orange sky, hanging over polished water.
Shadowed banks tumble down to the loch. It's dusk on a Sunday evening and we've stopped on our way home on the southern edge of the bonnie banks to stretch our legs.
It is beautiful, but it's difficult to enjoy because the beach is covered in litter: dozens of plastic bottles, takeaway wrappers and carrier bags filled with rubbish.
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