The Jordan Valley is an elongated depression located in modern-day Jordan and Israel.
The valley is a pivotal plot point throughout the third season. U.S. President Frank Underwood endeavours to form a joint peacekeeping force in the region with Russia, but is met with hostility from Russian President Viktor Petrov. This is due to Petrov believing deployment of American troops in the region would be uncomfortably close to Russia's sphere of influence in the Caucasus.
After an IED kills eight Russian soldiers, Frank Underwood authorises a black ops mission in the region to determine the cause, as Russia restricts access to the site. This fails, and results in the death of a U.S. Navy SEAL by friendly fire from the Russians. Frank Underwood and Viktor Petrov later meet in a Russian bunker in the region to negotiate, a meeting which results in Frank removing the U.S. missile defense system in the Czech Republic and removing Claire Underwood from the Ambassadorship in exchange for Russian support in the region.