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

• erasions
• Erasmus
• Erastian
• Erastianism
• erasure
• erasures
• erathem
• erathems
• Erato
• erbia
• erbias
• erbium
• erbiums
• ERDF
• Erdgeist
• ere
• e-reader
• e-readers
• Erebus
• erect
• erectable
• erected
• erecter
• erecters
• erectile