The exercise below is a bit more difficult than the ones I usually post here. But think of the subject, then you will be able to put the letters in the correct order.
Allons-y!
If you are lost, check out this list where you can find the English meaning of the words. However, be cautious, they are not in the correct order :-)
archipelago
brook
cave
cliff
glade
marsh
ravine
reef
strait
waterfall