Mountain Ancient Caravan Trail was once an access to the hot springs by the Nanliao path. Before, there were no roads around the island and the only route that crossed over Green Island was the Mountain Ancient Caravan Trail. Today, the mountain trail is a great place to experience Green Island’s mountain scenery! The total length of the trail is 1.85 km and it takes about 90 minutes round trip. The general route that most people take is from the west side of the trail which starts near the former village of the Chinese Academy of Sciences. The whole trail is mostly steep steps. Good physical condition is required for the trail.