Question

The Cotswolds Lost Canal

Answer 1

Almost as old, but not yet quite abandoned. :

Answer 2

Popularly known as Grand Canal, the Beijing–Hangzhou Grand Canal is the longest and the oldest canal in the world. Connecting China's the Yellow River and Yangtze River, the canal goes through several provinces in the country as well as connects with several other rivers.

Comments

Have you been there in your travels, Rooster? This canal is fascinating...I recall the Yellow River is one of two places in the world running beside hills piled up from volcanic loess, over the millennia...along the Missouri River in western Iowa being another...