Where is the lost city in Indiana Jones and the last crusade?

In "Indiana Jones and the Last Crusade," the lost city referred to is the location of the Holy Grail, which is hidden in a temple in the mountains of Jordan. The film specifically showcases the site known as Petra, an ancient city carved into rock, which serves as the backdrop for the climactic scenes involving the search for the Grail. The film's portrayal emphasizes both the historical significance and the dramatic beauty of the location.