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An interesting idea popped up - there is a rather short and narrow section of flat land between the Jordan valley and the Mediterranean (Haifa). Digging a rather sizable canal wouldn't be so difficult, which would completely flood the valley all the way up to the Sea of Galilee, effectively giving Israel a very nice natural border, as well as increased rainfall in the region. The biggest drawback is the fact that the Jordan river is now completely submarine and therefore useless, but it's also at the same time a big fuck you to Jordan the country. It will also make invasion of the Golan difficult. On the other hand, the evaporation will be slightly higher than on the Mediterranean, making for nice sea salt production potential.
So who is the most plausible to do it? The Israelis? The British? Perhaps even the Ottomans? Note that basically this area in red will be flooded.