is one of two main dialect families of Welsh (cym, ISO 693-3) spoken in Wales, the other being Southern Welsh. The Welsh counties of Anglesey, Gwynedd, Conwy, Denbighshire, Flintshire, and Wrexham in the United Kingdom are considered to comprise the unofficial region of North Wales shown in Figure 1 (as designated by StatsWales 2018). Within this area there are further dialectal differences that are beyond the scope of this analysis, which considers the general features of Northern Welsh as a whole. However, see Thomas & Thomas (1989) for an overview of differences between eastern and western varieties of Northern Welsh.Welsh is a Brittonic Celtic language, more closely related to Cornish and Breton than to Celtic languages in the Goidelic branch: Manx, Irish, and Scottish Gaelic (Ball & Fife 1993). Like all Celtic languages, Welsh has verb-initial word order and a system of initial consonant mutation. Initial consonant mutation is the remnant of historic sandhi processes which conditioned predictable phonological alternations. Today, the phonological triggers for these alternations are opaque or absent, and mutation is best described as a morphophonological process that is found in a small set of lexical items and syntactic patterns (see section 'Mutation' below for further detail).Phonetic description of Welsh has a long history, notably Sweet (1882) and S. Jones (1926). More recent work includes a description of the vocalic system (G. E. Jones 1971(G. E. Jones , 1972, a description of Welsh stress (B. Williams 1999), a collected volume reporting a