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Yeah, there's many places in England that Argyll should know about with place names related to the name "Mercia".
'Mersey' is the most obvious, but there's a river near the Solway Firth and a few other places dotted around which are called 'Merse' and similar.
Many of the places I see it would indeed have been possible marches between Germanics and Celts. The one near the Solway Firth is interesting, to me it suggests that there must have been a sort of no-man's land between the Angles encrouching on the Cumbrian Lowlands and the Britons across the Firth.
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