This prestigious volume contains the proceedings of the 1st Asia-Pacific Water Summer, the first ever water summit to be convened in the world. The theme of this summit was "Water Security: Leadership and Commitment". Attended by many high-level dignitaries, leaders of the region made commitments and launched initiatives to tackle the water challenge. The summit included speeches by the former Prime Minister of Japan, Yoshiro Mori; HIH the Crown Prince of Japan; Prime Minister of Japan, Yasuo Fukuda; Ambassador-at-Large of Singapore, Prof. Tommy Koh; HRH Prince Willem-Alexander of the Netherlands; United Nations Secretary-General, H E Ban Ki-moon; and 10 heads of government from the region.The thematic sessions covered in this volume are climate change, water financing, water-related disaster management, water for development and ecosystems, development of knowledge and lessons, increase in local capacity, monitoring of investments and results, and the CEO water mandate. The concrete initiatives launched at the summit are also mentioned.