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

• tugboats
• tugged
• tugger
• tuggers
• tugging
• tuggingly
• tuggings
• tughra
• tughras
• tughrik
• tughriks
• tug-of-love
• tug-of-war
• tugra
• tugras
• tugrik
• tugriks
• tugs
• tugs-of-war
• tug the forelock
• tui
• tuile
• tuille
• tuilles
• tuillette