Prince Harry has been out of contact with the Royal Family for almost half a decade since he stepped down from his royal duties with the British Crown. However, the Prince won’t let his memories be shut down, particularly when it comes to his late mother, Princess Diana.

In a heartbreaking tribute, the Duke of Sussex has honoured Princess Diana, vowing to keep her memory alive. The Prince shared Diana’s story and his love for Africa in a new book. He states Africa feels like his “second home”, in the new National Geographic book, “Okavango and the Source of Life.”

“This paradise has been my second home for more than 25 years, a place to escape and be enveloped by nature’s sheer magnificence. Back in 1997, in Huambo, Angola, just a few miles from one of the sources of the Okavango, my mother walked through a live minefield being cleared by the HALO Trust, a humanitarian land mine clearance charity. That famous walk was a turning point in the fight against these lethal devices.”

This excerpt shared with PEOPLE, Prince Harry keeps reflecting on Diana’s most famous humanitarian causes. He even paid tribute to the late Princess by completing the landmine walk with the HALO trust in 2019. The new National Geographic book by Steve Boyes is set to hit shelves on March 3.