73136
Semi-diurnal tides dominated coastline , but some areas such as the South China Sea and the Gulf of Mexico are primarily diurnal .
 South China Sea, Gulf of Mexico
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 South China Sea, Gulf of Mexico