hydrographic(of or pertaining to hydrography) adjective [UK: ˌhaɪ.drə.ˈɡræ.fɪk] [US: ˌhaɪ.drə.ˈɡræ.fɪk]
bacino idrograficonoun {m}
drainage basin [drainage basins](topographic region in which all water drains to a common outlet) noun [UK: ˈdreɪ.nɪdʒ ˈbeɪs.n̩] [US: ˈdreɪ.nədʒ ˈbeɪs.n̩]