No. Australia contains over 7,868,850 square kilometers compared to Japan's 377,835 square kilometers.
Japan is 377,835 km2
Japan's area is 146,000 square miles (378,000 square kilometers).
The Black Sea covers an area of approximately 436,000 square kilometers.
377,944 km2
The South China Sea of Japan is bigger than the Yellow Sea of Okhotsk. The former is 1.351 million square miles while the latter is 611,000 square miles.
The Caspian Sea is 143,244 square miles, or 371,000 square kilometers in size.
The Mediterranean Sea is larger than the North Sea. The Mediterranean is approximately 2,500,000 square kilometers (970,000 square miles) while the North Sea is approximately 750,000 square kilometers (290,000 square miles).
The surface area is 750,000 square kilometers
The area of Dead Sea is 810 square kilometers.
The area of Laccadive Sea is 786,000 square kilometers.
The area of Southend-on-Sea is 41.76 square kilometers.