thalweg or talweg /tälˈveg, -vāhh/ (geology)

1. The longitudinal profile of the bottom of a river bed
2. The middle of a main navigable waterway, acting as a boundary between states

• uroboroses
• urochord
• Urochorda
• urochordal
• Urochordata
• urochordate
• urochordates
• urochords
• urochrome
• urochromes
• Urodela
• urodelan
• urodelans
• urodele
• urodeles
• urodelous
• urodynamics
• urogenital
• urogenous
• urographic
• urographies
• urography
• urokinase
• urokinases
• urolagnia