Horlaceni Arinis is an extensive 5-hectare reserve that shelters and protects by law the black alder (Alnus glutinosa) or the anin, a leaf-shaped shrub that has a dark brown autumn. The Reserve lies on the Jijia Plain, being located in the village of Horlaceni, in the village of sendriceni and part of the Dorohoi Forestry. It is a forest reserve included in category IV - ICUN, being a management area for the habitat existing here.