Chibbyr Drine or Thorntree Well is a famous well, visited for medicinal aid according to Feltham (1798).  Kermode located it to the east of the Rifle Range (SC 28576692). It is described as a small clear spring 0.3 metres across set in marshy ground with no trace of stonework. A band of seaweed immediately east of the spring shows that it is constantly covered by the sea.