Which island is mysteriously nicknamed the garden of Denmark?, The island nicknamed “the garden of Denmark” is Funen (Fyn in Danish). This nickname is given because of the beauty of nature and landscapes that the island has to offer. Funen is Denmark’s third largest island and is known for its green meadows, rolling hills and picturesque villages, making it an idyllic destination for nature lovers. The island is also known as the birthplace of the famous Danish fairy tale writer Hans Christian Andersen.