January 2019. Filmmaker Karim Aïnouz decides to take a boat,群山水手 cross the Mediterranean and embark on his first journey to Algeria. Accompanied by the memory of his mother, Iracema, and his camera, Aïnouz gives us a detailed account of the journey to his father's homeland; from the sea crossing to his arrival in the Atlas Mountains in Kabylia - a mountainous region in northern Algeria - to his return. Interweaving present, past and future.