"Brimstone" refers to a yellow mineral called sulfur that has a strong, unpleasant smell when burned. It has been associated with fire and is often used to describe the burning of something or a fiery punishment. Full definition
From this location there is easy access to the Robert Bradshaw International Airport, the UNESCO World Heritage Site of Brimstone Hill, downtown Basseterre and the local beaches of both leeward and windward sides of the Caribbean Sea. (breakingtravelnews.com)