Serene Sci-Fi Ringworld Landscape

A serene scene on a massive artificial ringworld: a lone explorer sitting by a crystal-clear river with a breathtaking view of the ring curving into the sky, distant megastructures, and a bright central star. Soft golden hour lighting, lush vegetation, sense of wonder and scale. Cinematic landscape, hard sci-fi inspired by Larry Niven, ultra-realistic, peaceful yet epic.