Emperor Naruhito and King Willem-Alexander Visit Dutch Flood Control Research Facility

Emperor Naruhito of Japan and King Willem-Alexander of the Netherlands jointly visited the Deltares flood control research facility in Delft on June 17, 2026, to observe advanced water management research. The facility features a large outdoor water channel capable of simulating waves exceeding four meters in height, which is used to test the structural integrity of embankments constructed from natural materials such as grass and soil. During the inspection, Emperor Naruhito inquired about the effectiveness of wave barriers and the methods used to generate waves, demonstrating keen interest in the facility's innovative approaches to flood defense.

Both leaders share a personal commitment to addressing water-related challenges. Emperor Naruhito previously served as honorary president of the United Nations Water and Sanitation Advisory Committee during his time as Crown Prince, while King Willem-Alexander held the position of chairman of the same committee. This shared background underscores the bilateral focus on water management and flood mitigation, issues of particular relevance to both Japan and the Netherlands, which face significant water-related infrastructure challenges.

The visit reflected the importance both nations place on collaborative research and development in water resource management and disaster prevention. Following the inspection, Empress Masako spent the evening at Amsterdam Royal Palace in preparation for an official dinner. The tour highlighted the advanced scientific research being conducted at Deltares and reinforced the commitment of both monarchs to tackling global water challenges through innovation and international cooperation.