During interwar, French Indochina became more and more aware of its touristic potential. Architectural jewels in Cambodia as well as climatic stations in Tonkin and Annam or safe shores of Cochinchina represented new sources of prestige and income. However, the main challenge remained to attract wealthy customers to these regions. The natural catchment area has led the colonial authorities to take an interest in Hong Kong. The promotion of Indochina in the British colony took different forms and reveals the interests at stake. France developed an active communication strategy, invited distinguished officials with great pomp and transformed its consulate in a showcase of Indochina… The target audiences were to be cherished: Chinese elites were possible investors and the British colonials were latent allies. In this process, two actors were particularly involved: the French consul based in Hong Kong and the director of the Messageries Maritimes shipping line agency. Both struggled to attract passengers and visitors and, at the same time, were influenced by the British colony own emerging touristic policy. The information they reported and their advices contributed to shaping tourism in Indochina. The study of different public and private sources (the diplomatic archives in Nantes and La Courneuve for the first actor, the French Lines’ archives in Le Havre for the latter, not to mention the colonial archives in Aix-en-Provence) allows to highlight a new interdependence between European colonies in Far East. Mutual inspiration, exchanges of good practices… the famous route mandarine obviously leads to Hong Kong.