what ocean borders japan to the east

The ocean that borders Japan to the east is the Pacific Ocean.

Quick scoop

Japan is an island nation surrounded by several seas, but its entire eastern coastline opens directly onto the vast Pacific Ocean , which lies between Asia and the Americas.

In addition to the Pacific, Japan is also bordered by the Sea of Japan to the west, the Sea of Okhotsk to the north, and the East China Sea to the southwest, but none of these are east of Japan.

TL;DR: Japan’s eastern coast is on the Pacific Ocean.

Information gathered from public forums or data available on the internet and portrayed here.