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Hertfordshire (/ˈhɑːrtfərdʃɪər/ (ⓘ) HART-fərd-sheer utawi /-ʃər/ -shər; ketah kaancengang Herts) inggih punika county sérémonial sikelod Inggris. Mawatesan sareng Bedfordshire lan Cambridgeshire sikalér, Essex sikangin, London Raya sikelod, taler Buckinghamshire sikauh. Paumahan pinih ageng ipun ring Watford.