[1] The Zalomka River in its upper course runs through western fringes of Gatačko Polje, and in a section from Rašćelice to Fojnica is called Đerope.

[3] The Zalomka River basin, particularly as part of the Nevesinjsko Polje, is a tectonic depression that is bounded by mountain ranges of different heights and highlands.

The exact boundaries of the plateau and watersheds are difficult to determine in the karst due to the extreme porosity and cracking of the limestone that drains water underground.

[3] Regardless of high ecological value and even higher vulnerability, the plans of harnessing hydroelectric energy from hydropower in Eastern-Herzegovina karst of Bosnia and Herzegovina are seriously considered by municipal and entity governments with revival of an old HES Upper Horizons concept,[3] so works on the initial stage of the project are already underway with construction of water canals and tunnels, as well as a dam for reservoir of HPP Dabar in Dabarsko Polje.

In addition to the usual multiple negative effects of hydro-technical and hydro-engineering projects undertaken in karst, where karst-environmental degradation has occurred as a result, with the main concern being destruction of underground ecosystems by drying or submerging, and the destruction of the highly endemic biodiversity, HES Upper Horizons will take from the Neretva direct flow cca 15 m3/s (530 cu ft/s) through tributaries the Buna, the Bunica and the Bregava (that's average discharge of Bregava River alone).

[3] The main argument in environmental circle is that concept of HES "Upper Horizons" and decision on its feasibility is based on researches and opinions made more than seventy years ago.