Jelas field is protected as a significant landscape 1995th year. The vast area of 20 800 hectares covers the territory of Slavonski Brod municipality and Maser, Bebrina, Sibinj Marine and the school. Northern boundary of the protected area goes on highway Zagreb - Lipovac and South from the confluence of the Sava River to the mouth Orljava Mrsunje and follows the course of their sjeveru.Blizina pond and river basin in this area makes it suitable for feeding and nesting birds. It is important resting and wintering of migratory species. Jelas field is declared as internationally important areas for birds, so called. IBAs (Important Bird Area). Widely known for sandhill cranes (Grus grus Latin), which in winter can be seen on the fields and the ponds. Slavonski Kobas, located within the boundaries of Jelas field this year showed the county recorder in the number of stork nests. It has been reported as 15 nests of white storks (Ciconia ciconia lat) in this village.