Black Pool (Isengard)

As head of the Order of Wizards, Saruman the White  delved  into  all  manner  of  wizardry. As the  Third Age  progressed,  the  Wizard,  failing  to  quickly  attain  the  degree  of  power  he  sought,  began  to  experiment  with  dark  and  evil  sorceries,  secretly   performing   incantations  that  were  atrocities  to  the  Order. Many  of   these   experiments   went  awry in one manner or another, and  a  few  left  behind  foul  and  spoiled  creations,   manifestations   of   evil  magic  that  Saruman  knew  not  how  to destroy or unmake. In  the   northwest   of   the   Nan Cúrunir,  some three miles from Isengard, lay  a  dark,  brackish  pool  surrounded  by  a  trio  of  tall  but  sickly  and    blackened    oakwoods. The water  was  fetid,  stagnant,  and  murky,  and  shedded  a  pale  luminescence  visible  from  a  thousand yards after nightfall. Those who  came  within  a  few  dozen  feet  of  the  pool  and  its  strange trees immediately sensed  the profanity of the place. The pool  had  a  will  of  its  own,   a   result   of   Saruman’s  channelling  of  fell  sorcery  into  it. The water  itself  was  now  perverted  and  unnatural,  a  rare  occurrence  in  all  of  Middle-earth. The oaks  had once been Huorns,  but  were  now   twisted   and   fouled   and  under  the  powerful  sway  of  the pool. When   living    creatures came within a few  feet  of  the  pool,  the  tainted   oaks   attempted  to knock them into the ensorcelled water, which was highly toxic to all living creatures.