They spent many days cruising the northern Pacific Ocean.他们在北太平洋航游了很多天。

the Indian Ocean印度洋

the seas and oceans of the world地球上的海和洋

There were few sights as beautiful as the calm ocean on a warm night.鲜有景致能与温暖夜色下风平浪静的大海媲美。

I went down to the ocean and took a swim.我下海游了个泳。