Pictured above: Flag of Saint Mayrilles (Fictional country)
I had a dream that I was a vlogger with a crew of fellow vloggers and we went to a country called Saint Mayrilles and I saw a flag like this flying from a rock in a sea (the flower was more circular and looked more like a cabbage/lettuce, but I suck at drawing flowers so I made one up)
The areas we visited looked like a country in the tropics but with weather patterns and it's surrounding waters were similar to England's (I haven't been to England so idk for sure) and the air was mildly chilly for a tropical country. So chances are the visit took place in early Autumn to late Winter