About 50 yards. The 'Eye' is just outside the hotel.
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The address of the London Aquarium is County Hall, Westminster
Bridge Road, London, SE1 7PB. One can contact them by phone to get
details on opening hours.
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There is a Hall County, in Georgia, Nebraska and Texas
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London Hall is 5' 8".
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London is not a central county in England, it is in the South
East of the country. Central London is not a county, but is within
the county of Greater London.