I don't really think of water when I think of Morocco. These interesting stamps, two of a series of five issued in 2015, arrived on an envelope from Eva. Lake Sidi Bourghaba is a national park, famed for its biodiversity. Link to wikipedia article (in French only).
Aguemam Azegza is also part of a national park in Morocco. Link (in French).
For links to bodies of water on stamps, go to Sunday Stamps.