Oderoya Island is located to the south of the city of Kristiansand and was owned by the Norwegian government as it was used as a military naval base and training area, and later the island returned to the municipality of Kristiansand and has been known as a recreational area since then; You can enjoy visiting small beaches and swimming in parts of them. There are also hiking trails, and it is worth noting that some ruins are still present, such as old walls, a gunpowder stockpile and an old hospital.