Not that it matters but the Immaculate Conception is not the Virgin Birth of Jesus, it's Mary's conception since she was born without Original Sin.

Reverse image search got me a reddit post crediting @shoutingisfun but don't quote me on that

Looks like the Salt Lake, other bodies of water like Lake Okeechobee in Florida or the Salton Sea are the same color.

https://www.pixiv.net/en/artworks/116294852