A very dark blue - like the sky at night or the deep sea. In a certain light and from a specific angle, it can look almost black, but the beautiful dark blue peaks through.
The I Love the Seaside Surf & Travel Guide to Morocco is a 224-page printed book (English language) exploring the Moroccan Atlantic coast: from Tangier in the north, to Dakhla in the south, and some bonus inland diversion-worthy routes along the way.