Oxygen Masks On!

Mathilde reached the highest point on the Canal du Midi, almost the height of K2, a dizzying 189 metres above sea level. Australians are proud of the Snowy Mountains Scheme: over three hundred years ago Monsieur Riquet brought about a canal connecting sea to shining sea, and he turned rivers around to provide water to feed it (each time a lock is used, water goes from one level to a lower level so that, without replenishment--30 million cubic metres per year--the system would run dry).

There were many signs saying parting of the waters. 

This sign "parting of the waters" made me think of Moses and the Red Sea but of course it means watershed.

Riquet's descendants erected an obelix to mark his achievement, with a symbolic girl replenishing the canal, which links Poseidon (representing the Atlantic) and Venus (I'm sure it's significant that this goddess was chosen to represent the Mediterranean). 

 Then Mathilde went to bed.