A mineral water spring is located in village Kuljenovci, on the southern slope of the mount Markovac, on the estate of Pero Mamić's family. The Spring is located six kilometers northwest from Derventa. In the past, there was a stone well, afterwards it was restored by setting the concrete pipes. The water is cold mineral of Cl-Na type.
This is one of the most significant touristic resources of Derventa Municipality. It is necessary to conduct chemical analysis and determine physical characteristics of the water, as well as to assess the profusion of the spring. If the water meets the required conditions, it will be necessary to develop a touristic complex with the corresponding infrastructure.