The boat had been missing since Monday afternoon when it left the tiny island of Gorgona off Colombia 's southwest coast with sightseers for a return trip to Narino province , near the border with Ecuador .
<response> The boat had been missing since Monday afternoon when it left the tiny island of <location>Gorgona</location> off <location>Colombia</location> 's southwest coast with sightseers for a return trip to <location>Narino</location> province , near the border with <location>Ecuador</location> . </response>