Gunja Mosque is the oldest active mosque in Croatia built in 1969. It is located in the village of Gunja in the Croatian part of Syrmia.
Wikipedia https://en.wikipedia.org/wiki/Gunja_Mosque
Address 39 Maka Dizdara, Gunja 32257, Croatia
Coordinates 44°53'23.594" N 18°49'11.315" E