Gruinard Island is a small, oval-shaped Scottish island approximately 2 kilometres long by 1 km wide, located in Gruinard Bay, about halfway between Gairloch and Ullapool. At its closest point to the mainland, it is about 1 km offshore. In 1942, the island became a sacrifice zone, and was dangerous for all mammals after military experiments with the anthrax bacterium, until it was decontaminated in 1990.

Ross-shire is a historic county in the Scottish Highlands. The county borders Sutherland to the north and Inverness-shire to the south, as well as having a complex border with Cromartyshire – a county consisting of numerous enclaves or exclaves scattered throughout Ross-shire's territory. Ross-shire includes most of Ross along with Lewis in the Outer Hebrides. Dingwall is the traditional county town. The area of Ross-shire is based on that of the historic province of Ross, but with the exclusion of the many enclaves that form Cromartyshire.