In addition, the Hatenashi mountain range is a dividing mountain of neighboring rivers (the Kumano-gawa River, the Hiki-gawa River, the Tonda-gawa River, and the Hidaka-gawa River), and adverse effect caused by constructions on the rivers is concerned.
また、果無山脈それ自体が近隣の河川（熊野川、日置川、富田川、日高川）の分水嶺となっており、工事による河川への悪影響が懸念されている。