Menton is built over rivers (perhaps too large a word - streams?) - you'd not know it as you walk along the promenade but at the base of every valley the water pouring off the mountains, after rain, has to go somewhere and of course, that is to the sea.
Here you see water from the Torrent de Gorbio where it meets the sea. The smaller photograph shows that same river taken from the opposite direction. You see the bridge - part of the promenade that joins Roquebrune-Cap-Martin to Menton. You can also see some of the rubbish thrown up by the storms. (Click to enlarge)
Recently, the Carei, the river running along the Route de Sospel (the road that runs from the sea to the autoroute) has been built over at vast cost and now the main road runs over it. And in Nice-Matin the other day, I read millions of euros are to be spent doing repair work over the river that brings water down another valley - the Borrigo.