It measures roughly 24 metres east to west and 13 metres north to south, dimensions modest enough that it would barely register on a map, yet its shape and placement mark it out as almost certainly man-made.

This is a crannog, a type of artificial or partially artificial island dwelling found across Ireland and Scotland, typically constructed during the early medieval period though some were built as early as the Bronze Age and others remained in use into the seventeenth century. Builders would pile timber, brush, peat, stone, and other materials into shallow lake water, creating a raised platform that offered both security and a degree of social prestige. The surrounding water served as a natural moat, and crannogs were often home to wealthy families or minor lords. The one at Corralough sits roughly 200 metres east of another recorded site in the same area, which suggests this part of the Galway lakeland may have supported a cluster of lake-based activity at some point in its past. Beyond its dimensions and its covering of rushes, the site has not been formally visited or excavated, so the details of its construction, date, and original occupants remain unknown.