Guided Birding Tour in October 2019 Frank, Jim, David from USA in October Ganghwa island, Cheonsu Bay, Hwaseong lake & mudflat Bird list Species Name Ganghwa island Cheonsu Bay Hwaseong lake & mudflat Greater White-fronted Goose O O Tundra Bean-Goose O O O Ruddy Shelduck O Mandarin Duck O O O Garganey O Northern Shoveler O Gadwall O Eurasian Wigeon O Eastern Spot-billed Duck O O O Mallard O O O ..