Damanik, S.E., Rozalina, R. and Nurrachmania, M. 2021. Influence of sipinsur ecotourism area business opportunity on regional development in humbang hasundutan regency. International journal of business, economics & management. 4, 1 (Apr. 2021), 130-134. DOI:https://doi.org/10.31295/ijbem.v4n1.1336.