Ha-ha! Just reminds me of an old joke my dear Dad used to tell, he having been in the British Royal Navy during WW2. It was about some American sailors who were still sailing up river way up beyond Grangemouth, still looking for “The Fourth Bridge”. (In those days there was only the iconic Forth Rail Bridge until you got to the Kincardine Bridge). Now we have the Forth Road Bridge, opened in 1964, and the Queensferry Crossing, very much more recent, and the Clackmannan Bridge too.
And as yet unanswered, the Forth is the name of the river.