I grew up by the sea, in the Canary Islands, there the sea is raw and clashes against dark volcanic rock, so the colour is more ultramarine, bit also plunges into the depths not far from the islands shore as they are individually created by hot spots. I miss the sea, even wrote a song about the longing for the sea, but rarely see it now. https://youtu.be/yAt5OcNKzSo?si=3LsXxDVRdV1sxtfU