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

• lightermen
• lighters
• lighter-than-air
• lightest
• light-faced
• light-fast
• light-fingered
• light flyweight
• light-footed
• light-footed archaic light-foot
• lightful
• light-handed
• light-headed
• light-headedly
• light-headedness
• light-hearted
• light-heartedly
• light-heartedness
• light heavyweight
• light-heeled
• light horse
• light horseman
• light horsemen
• light horses
• lighthouse