The latter kings joined together [as allies] in the Valley of Siddim, which is [now] the [Dead] Sea of Salt.
All these were joined together in the vale of Siddim, which is the salt sea.
All these joined together in the vale of Siddim (the same is the Salt Sea).
These latter kings formed an alliance in the Siddim Valley (that is, the Dead Sea).
All these came together in the wooded valley, which is now the Sea of Salt.
All these came together into the woodland vale, which now is the salt sea.