Question: What structure that sits on a cliff overlooking the River Ness appears on the reverse of The Royal Bank of Scotland £50 note, is a banknote of the pound sterling he second largest denomination of banknote issued by The Royal Bank of Scotland that also features Lord Ilay?
Sentence (from "The Royal Bank of Scotland £5 note"): The current polymer note, first issued in 2016, bears an image of the author Nan Shepherd on the obverse and a pair of mackerel on the reverse.
Relevant evidence: No