If Length of the longest canal tunnel (Rove Tunnel in France) (7.12 km) was a standard unit ...
Direct distance from Cape Town to Cairo (7,250 km)...more would be 1000 x Length of the longest canal tunnel (Rove Tunnel in France)
Circumference of Pluto (7,230 km)...more would be 1000 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of South America (North to South) (7,150 km)...more would be 1000 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Amazon River (6,990 km)...more would be 1000 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Danube River (2,880 km)...more would be 400 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Limpopo River (1,800 km)...more would be 250 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Beijing-Hangzhou Grand Canal (1,794 km)...more would be 250 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Peripherique around Paris (35 km)...more would be 5 x Length of the longest canal tunnel (Rove Tunnel in France)
Length of the Starship `Enterprise` in the Original Star Trek series (289.7 m)...more would be 1/25 of Length of the longest canal tunnel (Rove Tunnel in France)
Length of a Boeing 747 airliner (70.7 m)...more would be 1/100 of Length of the longest canal tunnel (Rove Tunnel in France)
Distance to target in Olympic Archery competition (70 m)...more would be 1/100 of Length of the longest canal tunnel (Rove Tunnel in France)
Length of a basketball court (28 m)...more would be 1/250 of Length of the longest canal tunnel (Rove Tunnel in France)
Men's Olympic Triple Jump record (18.09 m)...more would be 1/400 of Length of the longest canal tunnel (Rove Tunnel in France)
Length of a London Underground carriage (18 m)...more would be 1/400 of Length of the longest canal tunnel (Rove Tunnel in France)
Length of a standard full size snooker table (3.57 m)...more would be 1/2000 of Length of the longest canal tunnel (Rove Tunnel in France)
Length overall of a `RS:X` windsurfing board (2.86 m)...more would be 1/2500 of Length of the longest canal tunnel (Rove Tunnel in France)
Width of a ice-hockey goal (1.8 m)...more would be 1/4000 of Length of the longest canal tunnel (Rove Tunnel in France)
Is That A Big Number? - The Book
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
