Mother-of-three Catherine, who is married to heir-to-the-throne Prince William, released "Winter", the final instalment of her year-long "Mother Nature" video series, on her official Instagram and X.

"Even in the coldest, darkest season, winter has a way of bringing us stillness, patience and quiet consideration," Catherine, also known as Kate, says in the video's voiceover.

"I find myself reflecting on how deeply grateful I am... Fears washed away.

"Come to peace with our tears and discover what it means to be alive. To be at one with nature, a quiet teacher and a soft voice that guides, in memory, helping us to heal," she added.

Catherine is shown walking through wintry English countryside, interspersed with clips of other UK landscapes.

The nearly two-minute-long video posted on social media comes two years after the start of Catherine's health problems.

In January 2024, her Kensington Palace office announced she was facing weeks in hospital after successful abdominal surgery.

The surgery was for a non-cancer-related health issue, the palace said.

Weeks later, however, on March 22 an emotional Kate revealed in a video message that she had been diagnosed with an unspecified cancer and had begun preventative chemotherapy.

Her diagnosis coincided with King Charles III, her father-in-law, also being diagnosed with cancer, which was revealed by Buckingham Palace on February 5, 2024.

Charles, 77, said last month that his own treatment was expected to be pared back this year.