tə pɹɪzˈɜːv ðɪ ˌɑːɹkɪtˈɛktʃɚɹəl hˈɛɹɪɾɪdʒ ʌvðɪ ˈɛɹiə, wˌɪtʃ ɹˈeɪndʒᵻz fɹʌm lˈɑːɹdʒ nˈʌmbɚz ʌv tʃˈæpəlz ænd dɪsjˈuːzd mˈɪlz tə fˈɔːɹmɚ slˈeɪt kwˈɔːɹiz ænd kˈæsəl ɹˈuːɪnz.
To preserve the architectural heritage of the area, which ranges from large numbers of chapels and disused mills to former slate quarries and castle ruins.