: Observers often note features like broad cheekbones, a rounded chin, and "hooded" eyes. Some also point to a shorter nose bridge with a slight tip upturn as a Celtic trait.

: Ireland has the world's highest concentration of red hair (estimated at over 10% of the population). However, mid-brown to dark-brown hair paired with blue eyes is statistically more common.

Known as the for its lush green landscapes, Ireland's geography is defined by a central plain surrounded by coastal mountain ranges.

: Bright eyes—particularly blue and green—are highly prevalent.