Sub-cluster 1-1 is the largest sub-cluster in terms of number of small areas comprising the sub-cluster as well as the total sub-cluster population.
Is-glwstwr 1-1 yw’r is-glwstwr mwyaf o ran nifer yr ardaloedd bach sy’n rhan o’r is-glwstwr yn ogystal â chyfanswm poblogaeth yr is-glwstwr.