The county of Caithness is well known for its water. The Flow Country is a vast expanse of wetlands and ancient blanket peat bog that covers around 4,000km² and is home to a rich variety of wildlife. It has been earmarked as a potential UNESCO World Heritage Site and is seen as the last real wilderness of Scotland. The Wolf Burn is little documented owing to its size and travels for only a few miles from its source before it reaches the sea. A subterranean spring that rises in the wetlands upstream, it has been flowing the same path for thousands of years. No one seems to know where the name of the burn originates, but wolves were certainly once commonplace in Scotland and roamed Caithness in numbers in the 1500s. By the late 1600s they had been hunted and trapped to extinction.