Surrounded by coral reefs and rich marine life,Green Island is a volcanic island formed by Andesite. Both Amis and Yamis were once said to rule the area. During Qing Dynasty,fishermen from Siaoliuchiu,Pingtung County drifted here,found rich resources,and thus started a settlement on the island. Green Island is about 4 km long and 3 km wide. The altitude of its highest hill,Huoshaoshan,is 281m above sea level. A highway of 20 km in length now surrounds the island,which takes no more than half an hour to complete on a motorcycle ride.