1.
Atlantic Ocean
The ocean between the Americas to the west and Europe and Africa to the east.
大西洋 literally means 'great western ocean,' named from a Japanese/East Asian perspective where it lies to the west.
Etymology
The kanji 大 (great) + 西 (west) + 洋 (ocean). The name contrasts with 太平洋 (Pacific Ocean, 'great peaceful ocean'), which uses a different first character.