Rydal Water is a body of water located in Cumbria, which is a northwest county in England which borders Scotland. Rydal Water is a rather small lake, with the walk around it only being around 4.5 kilometers. It is largely popular because of its ties to William Wordsworth, as he is known to have lived near it. At one end of the lake lies Wordsworth Seat, which is believed to have been William Wordsworth's favorite place on the lake. Rydal Water is mentioned once in Recollections of a Tour Made in Scotland when Dorothy Wordsworth compares it to a Scottish lake: "a little oblong lake apparently not so broad as Rydale-water, with one small island covered with trees."
Sources:
https://en.wikipedia.org/wiki/Rydal_Water
https://www.10adventures.com/hikes/lake-district-national-park/rydal-wa…