A book written by Italian diplomat Marcello Mocchi, in which he describes the road he took during his journey through the Kingdom of Saudi Arabia, conveying his perceptions of the places he passed, the amount of distance separating the cities and villages he crossed, and an accurate description of those roads, citing evidence, And he reviewed the instructions that must be taken into account in order for the traveler or passer-by to avoid getting lost in those roads. Two editions of the book were issued in Arabic and English.