1. 峰顶   mountain   reef   glacier   peak   Hint Half-n-half Clue   2. 平原   ocean   sea   lake   plain   Half-n-half Clue   3. 海湾   ocean   glacier   bay   country   Half-n-half Clue   4. 城市，镇   reef   waterfall, falls   bay   city, town   Half-n-half Clue   5. 半岛   oasis   country   peninsula   glacier   Half-n-half Clue   6. 山   plain   mountain   strait   oasis   Half-n-half Clue   7. 绿洲   oasis   glacier   lagoon   mountain   Half-n-half Clue