Area: 0.76 square miles
Highest elevation: An Eilid 348 feet
Gruinard Island is a small, oval shaped Scottish island approximately 1.2 miles long by 0.62 miles wide, located in Gruinard Bay.
The island was made dangerous for all mammals by experiments with the anthrax bacterium, until it was decontaminated in the late 20th century.
Visits to the island were prohibited, except periodic checks by Porton Down personnel to determine the level of contamination.