Buttermere is a lake located in the Lake District National Park in North West England. It is approximately 1.25 miles long and a quarter of a mile wide, and is surrounded by steep fells, including Haystacks and Red Pike. The lake is fed by a number of small streams and is drained by Buttermere Dubs, which flows into Crummock Water.

The lake is popular for outdoor activities such as walking, hiking, and fishing. There are a number of walking routes around the lake, including a circular walk that takes in both Buttermere and Crummock Water. The lake is also home to a variety of fish, including brown trout and arctic charr, which make it a popular destination for anglers.

In addition to the lake itself, there are a number of other attractions in the area, including the Honister Pass, a high mountain pass that links Buttermere with Borrowdale, and the nearby village of Buttermere, which has a number of shops, pubs, and cafes. The lake and its surroundings have also been featured in a number of literary and artistic works, including William Wordsworth's poem "The Solitary Reaper" and Alfred Wainwright's guidebook "A Coast to Coast Walk".