Fair Observer: The dispute over the Helmand River between Iran and Afghanistan is an old one. In the 1870s, when Afghanistan was still under British control, the border between the neighbors was drawn along the main branch of the river. Helmand is a lifeline for both countries. It is Afghanistan’s longest river and it runs into Hamoun Lake.  In March 2021, the Kamal Khan Dam finally opened after years of setback on the lower Helmand. Naturally, it was met with animus in Iran. In 1973, the two signed the Helmand River Treaty. The agreement guaranteed Iran with a monthly allocation of water from the river. But Tehran insists that its neighbor has consistently failed to hold its end of the deal. Click here to read more (external link).