What is "grumbla"

Grumbla (, meaning the cromlech) is a hamlet in the parish of Sancreed, Cornwall, England.

The remains of a possible prehistoric tomb, or cromlech, after which Grumbla is named, can be found at . It consists of a circular earth bank lined with big stones, but its identification is uncertain and it could be the remains of a hut circle. There is slab of rock, 50 metres north of this , set on edge and apparently artificially erected, which could be the support of a dolmen, or the retaining circle of a barrow.

The remains of the Iron Age hillfort of Caer Bran is 700 metres south of the hamlet, and the Iron Age settlement of Carn Euny is about 900 metres to the southwest.

Grumbla lies within the Cornwall Area of Outstanding Natural Beauty (AONB). Almost a third of Cornwall has AONB designation, with the same status and protection as a National Park.