Located in the Seogwipo area of Jeju Island, Soesokkak Estuary (쇠소깍) was originally called ‘Soedun’, which means a lying down ox, and it was only later that it became more widely known as ‘Soesokkak’. This is the mouth of the Hyodoncheon stream. As the fresh water meets the ocean, it broadens into wide slow flowing river. ‘Soe; means an ox, ‘so’ means a ‘pool of water’ and ‘Kkak means ‘the end’.