Bidon 5 is/was a desert halt in the Sahara Desert in Africa. It can be found along the way from Algiers to the Sudan.

It takes its name from the fact that its sign board is/was an empty gas-can with the numeral 5 painted upon it; and Bidon is French for "gas-can".

References

It is mentioned in Arthur Mee's 2 volume work "1000 Heroes: Immortal men & women of every age & every land." Page 284.