Anyway, in years past, I have blogged about trans-border water - rivers and the like- and discussed rivers that cross the DMZ.
Recently, North Korea announced they were going to increase water flow across the border, and in fact have done so.
From the article:
North Korean media said Sunday that as many as 143 millimeters of rain had fallen in a town near the border city of Kaesong while heavy rains had continued in many other regions for days.
Last October, the South demanded an apology from the North for the deadly flash flood, leading the communist neighbor to express regret and convey a message of condolences to the bereaved.