That river in Egypt

"This is one of the pages from the Book of Kells, an illuminated manuscript made in around the 800's. In my opinion, this is the goat of celtic manuscripts, though there are of course other cool ones like the Lindisfarne gospels. This is the style that I based my usual pictures on. This is much more intricate though, very impressive"

https://archive.org/details/book-of-kells/mode/2up