Often big engineering works are a testament to grand (geo-)political wills
France š«š· was pissed off at Spain šŖšø and the stupid Habsburgs, so it took matters into its own hands and made its own Gibraltar.
The Canal du Midi, built in the 1660sā1680s, pushed the frontier of civil engineeringālocks, aqueducts, and, crucially, a complex water-supply system (reservoirs like Saint-FerrĆ©ol) to keep a summit canal fed.
Economically, it never quite justified its cost. Tolls were high, traffic seasonal, and by the 19th century railways undercut it decisively. The canal solved a strategic problem that did not translate into sustained commercial dominance.
But as statecraft, it is hard to dispute. The same administrative machine that built fortresses and armies also built infrastructure at continental scaleāplanning, financing, and executing across decades.
The Canal du Midi is less a profit story than a demonstration of French capacity to reshape geography to serve policy.