In the late Ming, when the Imperial Eunuch San Bao set sail for "western seas," he still viewed the "outside world" from the perspective of China being the center. But his "western sea" was in fact today's Indian Ocean.
明末三寶太監「下西洋」，也是從中國「居中」的地理觀來看待世界，所謂「西洋」指的是今日的印度洋。