Tennyson's description of the lake into which an anguished Arthur throws his sword Excalibur is based on Bassenthwaite.
Bassenthwaite was an inspiration for an author. 
mnli hypothesis: Bassenthwaite was an inspiration for an author.  premise: Tennyson's description of the lake into which an anguished Arthur throws his sword Excalibur is based on Bassenthwaite.