Scotland has a varied geography ranging from rural lowlands to mountainous uplands and islands off its coast. It is located in northern Europe and has land borders with England to the southeast. Some of Scotland's most notable castles include Culzean Castle, built in the late 18th century on sea cliffs with ornate interiors, Balmoral Castle which became a royal residence during Queen Victoria's reign, and Castle Fraser, one of Scotland's largest and most elaborate castles. Caerlaverock Castle is a 13th century coastal castle that was besieged during wars for independence and rebuilt over centuries. Loch Ness is a famous deep freshwater lake known for reported sightings of "Nessie".