Water is slowly emerging as yet another potential cause for dispute between Ankara and Tehran. As of late, the two neighboring states have been at loggerheads over a number of issues, including Syria and Iraq, where they have opposing interests. After years of quiet diplomatic juggling, the issue of transboundary water management is gradually taking center stage in the two countries’ relations, a development that could, in the medium run, have serious repercussions for regional security, not least because Tehran has started to frame it in national security terms.