Marked by the River is a visual and narrative journey into Ethiopia’s South Omo Valley, one of the last places where people still live by ancestral rhythms. Through over 300 photographs, Simona Doyle shares the stories of five remarkable tribes: the Hamar, Karo, Mursi, Daasanec, and Aari. These portraits go beyond faces. They capture gestures, rituals, scars, and quiet moments of daily life. From body painting and scarification to courtship, cattle, and childhood play, each image reveals a way of living that is deeply rooted in tradition, yet always evolving. This is not a nostalgic postcard. It is a tribute to human resilience and beauty. Simona Doyle brings the reader into these encounters with honesty and care, reflecting on her own path as a photographer and traveller. What began as a journey across continents became something more lasting when she reached the Omo. Photography, for her, became a bridge between cultures and a way of listening, not collecting. Marked by the River is part travel story, part cultural record, and part personal reflection. It invites readers to see these communities not as frozen in time, but as alive, creative, and facing change on their own terms. The people in these pages are not waiting to be discovered. They are living their lives, and they allowed the photographer to witness them. This book is for those who are curious about the world, who care about tradition, who are drawn to beauty in all its forms. It is for anyone who believes that the best stories are told quietly, through presence and attention.