How many basalt columns make up the causeway between Causeway Head and Benbane Head?
Benbane Head:  It is in County Antrim, near the Giant's Causeway, which lies between Causeway Head and Benbane Head. Giant's Causeway: The Giant's Causeway is an area of about 40,000 interlocking basalt columns, the result of an ancient volcanic eruption.
about 40,000