Badhnesia (or Badhnisia, Badnhesia or Bahdnesia) is was a country in the original earth 2 where Johnny Thunder was tied to the magic Thunderbolt. Because of several retellings is unclear where is exactly, vary from a pacific island, a middle Europe country or an middle east Asia nation.
In the composed earth post crisis Badhnesia reappered as a wasted land because of the absence of the magic Thunderbolt with the adopted daughter of Johnny Thunder, Kiku, as the last badhnesian.
In Crisis Times Five, this was retconned with several people living in the middle-east like country, inspired in the Arabian Nights tales. The wise men from Badhnesia, a group of expert scientifics, adviced Captain Marvel how to deal with the impending attack from the fifth dimension.