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Reference.org
A31 road
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<p>The A31 is a major <a href="/facts/Trunk_road/bKLawUVq">trunk road</a> in southern <a href="/facts/England/U9mE5bGL">England</a> that runs from <a href="/facts/Guildford/WJNjq3WK">Guildford</a> in <a href="/facts/Surrey/xTGvM5Vk">Surrey</a> to <a href="/facts/Bere_Regis/Q0HFycCo">Bere Regis</a> in <a href="/facts/Dorset/Nk56BJr3">Dorset</a>. Its best-known section is the <a href="/facts/Hog%2527s_Back/BMTHvSBh">Hog's Back</a>, a ridge forming part of the North Downs between Guildford and Farnham in Surrey. </p>