Île-de-la-Cité is a small island located in the Seine River in the heart of Paris, France. It is one of the oldest parts of the city and is known for its historical significance. The island is home to several important landmarks, including the famous Notre-Dame Cathedral and the Sainte-Chapelle, a stunning Gothic chapel. The island is connected to the rest of Paris by several bridges, making it easily accessible. Visitors can explore its narrow streets, enjoy picturesque views of the river, and learn about its rich history, which dates back to the Roman era when it was known as Lutetia.