Buttermere

Buttermere – the lake by the dairy pastures – is 1.24 miles (2 km) long, 620 yards (570 m) wide and 75 feet (23 m) deep. It is one of the smallest lakes, offering peace and quiet in spades. The classic combination of lakes and mountains has made this popular with visitors since the beginning of tourism in the Lake District. A visit to Buttermere is principally for its natural attractions – as the area offers some of the best walking country in Lakeland. There is a footpath running round the perimeter of the lake, and lovely walks to the summits of Haystacks and Red Pike.

More info here