The southern African country is a place the couple know well - with Prince Harry reportedly whisking his fiancee away to holiday in 2017 to mark her 36th birthday.

The trip came a year after the pair's famous holiday in the country, where their love story began after meeting on a blind date.

The prince has revealed how they bonded in the African bush.

"I managed to persuade her to come and join me in Botswana and we camped out with each other under the stars... she came and joined me for five days out there, which was absolutely fantastic," he said.

Ms Markle's engagement ring features diamonds from the personal collection of Diana, Princess of Wales, and a stone from Botswana.

The US actor spoke about their special relationship with the African country as she described the significance of the precious stones in her ring from Harry.

In the engagement interview, she said: "And you know, to be able to have this - which sort of links where you come from and Botswana which is important to us and it's, it's perfect."

The Caribbean could be another honeymoon destination for the couple and they already have an invitation to return as a newlywed.

Gaston Browne, the prime minister of Antigua and Barbuda, made the offer during the prince's 2016 tour of the West Indies.

"I am told that there may be a princess and I just want to say that should you make the decision to honeymoon, then Antigua and Barbuda want to welcome you," Mr Browne said.

Australian Associated Press