World Water Day 2009 calls attention to the waters that cross borders and link us together.-- II. The law of transboundary aquifers.-- III. Istanbul Ministerial Statement.-- IV. Comments of the Forum on Democracy & Trade to the United States Trade Representative.-- V. International Boundary and Water Commission (IBWC) marks 120th anniversary.-- VI. 8th Summit of the Niger Basin Authority (NBA) Heads of State and Government.-- VII. The Niger Basin Water Charter.-- VIII. International Joint Commission (IJC) commends an initiative to eliminate the movement of invasive species.-- IX. G77 adopts Muscat Declaration on Water.-- X. Tanzania held to have violated investment treaty protections, but no damages flow from these breaches.-- XI. United States of America: Arkansas and Missouri sign water agreement.-- XII. Mekong River Commission (MRC): changes along Mekong challenge planning process.-- XIII. Recent books and studies on transboundary water issues.-- XIV. Update: ECLAC water-related researchThestatements and opinions reported in this Newsletter do not necessarily reflect the views, opinions, or official positions of the United Nations, and are to be exclusively attributed to authors, organizations and media quoted or summarized in the Newsletter