Length of the longest canal tunnel (Rove Tunnel in France)

Length of the longest canal tunnel (Rove Tunnel in France) (7.12 km)

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Neat Ratios ...

Length of the longest canal tunnel (Rove Tunnel in France) (7.12 km)

is 1/1000 of Direct distance from Cape Town to Cairo (7,250 km)...more
is 1/1000 of Circumference of Pluto (7,230 km)...more
is 1/1000 of Length of South America (North to South) (7,150 km)...more
is 1/1000 of Length of the Amazon River (6,990 km)...more
is 1/400 of Length of the Danube River (2,880 km)...more
is 1/250 of Length of the Limpopo River (1,800 km)...more
is 1/250 of Length of the Beijing-Hangzhou Grand Canal (1,794 km)...more
is 1/5 of Length of the Peripherique around Paris (35 km)...more
is 25 x Length of the Starship `Enterprise` in the Original Star Trek series (289.7 m)...more
is 100 x Length of a Boeing 747 airliner (70.7 m)...more
is 100 x Distance to target in Olympic Archery competition (70 m)...more
is 250 x Length of a basketball court (28 m)...more
is 400 x Men's Olympic Triple Jump record (18.09 m)...more
is 400 x Length of a London Underground carriage (18 m)...more
is 2000 x Length of a standard full size snooker table (3.57 m)...more
is 2500 x Length overall of a `RS:X` windsurfing board (2.86 m)...more
is 4000 x Width of a ice-hockey goal (1.8 m)...more

If this was a standard unit ...