1. Oceanus Procellarum (lunar mare); Ocean of Storms
Wikipedia definition
2. Oceanus ProcellarumOceanus Procellarum is a vast lunar mare on the western edge of the near side of the Earth's Moon. It is the only one of the lunar maria to be called an "Oceanus" (ocean). This is due to its size; Oceanus Procellarum is the largest of the maria, stretching more than 2,500 km (1,600 mi) across its north-south axis and covering roughly 4,000,000 km (1,500,000 sq mi). Nevertheless, it is still smaller than the surface area of the Mediterranean Sea on Earth.
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