Definitions

1. noun

The deepest part of a river valley or a stream, or the line that divides a valley or a stream into two roughly equal parts.

“The geologist studied the thalweg to understand the river’s erosion patterns.”

2. noun

In engineering, the lowest point of a watercourse, such as a river or a canal, used as a reference point for navigation and surveying.

“The thalweg of the canal was marked with a buoy to guide boats through the narrow passage.”