The Aramaru Observatory, a circular structure perched in the gorge section of Gyeyangsan Mountain, occupies the highest point of the Arabaetgil, a maritime path linking the West Sea with the Hangang River. Renowned for offering the most spectacular vista of the entire Arabaetgil, the observatory features a glass floor that provides a stunning overhead view of the Arabaetgil below. At night, the ambiance is further enhanced by the twinkling lights installed along the railings and floor, creating a mesmerizing atmosphere that captivates visitors.