1. 川、河川   island   bay   river   reef   Hint Half-n-half Clue   2. 島   lagoon   island   mountain   plateau   Half-n-half Clue   3. 潟湖 、潟   lagoon   country   desert   reef   Half-n-half Clue   4. 大洋, 海洋   lagoon   lake   ocean   cape   Half-n-half Clue   5. 礁、暗礁   lagoon   reef   sea   mountain   Half-n-half Clue   6. 湾   valley   bay   ocean   plateau   Half-n-half Clue   7. 大陸   ocean   plateau   bay   continent   Half-n-half Clue