One interesting thing in English is that the words 'mountain' and 'waterfall' change when they are part of a name.
"What a lovely photo! What mountain is that?"
"It's Mount Fuji in Japan."
"Kegon Falls are near Nikko, to the north-west of Tokyo. They are probably Japan's most famous waterfall. Another is Fukuroda Falls in Ibaraki, which are wide, rather than high."
'Mount' is singular (no 's') but 'Falls' always has an 's', and 'Falls' is after the name. What famous mountains and waterfalls can you think of?