A Gaelic word meaning a marshy or boggy place; a specific type of wetland or bog terrain.
From Irish/Scottish Gaelic 'bog' (meaning bog or marsh) plus the suffix '-ach' (meaning full of or characterized by). The term appears in place names throughout Ireland and Scotland.
This word is alive in Irish and Scottish place names—if you see '-agh' or '-ach' at the end of a location name, it often means that place is surrounded by wetlands, so ancient peoples literally named their geography based on what your boots would encounter.
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