Reference: atrailoftravels.wordpress.com/2013/05/27/olle-18-1-chuja-do-island/
Discover scenic attractions along 'Olle Course 18-1'
The northernmost islands of Jeju are about an hour's boat ride from Jeju Island. It is made up of two main islands, Sangchujado Island and Hachujado Island, as well as 38 uninhabited islands such as Chupodo Island and Hoenggando Island, and is a popular fishing destination due to the abundance of fish species. There are several photo opportunities along the Olle Course 18-1, including the Chujado Lighthouse, which provides a panoramic view of Chuja Islands, Chujado Elementary School, which is painted in a rainbow of colors, and the Navaron Sky Trail, which is a cliff path facing the blue sea.