Which of the following bodies of water does not act as a border for japan?

sea of japan
philippine sea
pacific ocean
bay of bengal

The Bay of Bengal does not act as a border for Japan.

Bay of Bengal

Explanation:

Japan is surrounded by the three seas, as to the north is the Okhotsk sea and to the west is the japan sea that separates for form the Korean Peninsula and to the southwest is the east china sea. That separates the  Ryukyu Islands from the east china sea. And Taiwan to the pacific.