"So how did the sword get in that pool?"
-- Ron Weasley (DH19)
A small, circular body of water located deep within the Forest of Dean. Snape’s patronus leads Harry to the lake from the campsite (DH33). Beneath the ice is the Sword of Gryffindor, which will not be summoned with magic. Harry dives into the lake to retrieve the sword, but the locket Horcrux starts choking him in the cold water. Returning after weeks away, Ron breaks the Horcrux’s chain and rescues Harry and the Sword of Gryffindor from the icy water (DH19).
The Forest of Dean is located in western England, near its border with Wales. Its history dates back thousands of years, having been used as everything from coal mines to a royal hunting ground.
Harry saved Ron from a lake during the second task of the Triwizard Tournament (GF26). -BB
In Arthurian legend, some accounts say that King Arthur received the sword Excalibur from the Lady of the Lake. (source: Wikipedia) -BB
Christian symbolism in the chapter "The Silver Doe" has been the subject of much conjecture, with many equating the silver doe with Christ and concluding that Harry's submergence represents baptism. (sources:How Harry Cast His Spell by John Granger, The Gospel According to Harry Potter by Connie Neal) -BB
From the Web
Official website on the Forest of Dean region: http://www.wyedeantourism.co.uk/