This is the 18032nd most frequent Russian word.
фонтанах
The Russian word "фонтанах" means "fountains" (prepositional plural form).
In this sentence, 'фонтанах' refers to the locative case plural form of 'фонтаны', meaning fountains.
В парке мы видели красивые подсветки в фонтанах.
In the park, we saw beautiful lights in the fountains.
Here, 'фонтанах' is used in the context of describing locations closely associated with fountains where people enjoy strolling.
Все любят гулять вокруг фонтанов в летний вечер.
Everyone loves walking around fountains on a summer evening.
The sentence uses 'фонтанах' in the locative case to specify where the coins are found, indicating the spatial relationship.