Expansive septet

This crossword clue is for the definition: Expansive septet.
it’s A 16 letters crossword puzzle definition.
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Possible Answers: SEAS.

Last seen on: NY Times Crossword 13 Jan 21, Wednesday

Random information on the term “SEAS”:

An ocean is a body of water that composes much of a planet’s hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. The phrases “the ocean” or “the sea” used without specification refer to the interconnected body of salt water covering the majority of the Earth’s surface. As a general term, “the ocean” is mostly interchangeable with “the sea” in American English, but not in British English. Strictly speaking, a sea is a body of water (generally a division of the world ocean) partly or fully enclosed by land.

Saline seawater covers approximately 361,000,000 km2 (139,000,000 sq mi) and is customarily divided into several principal oceans and smaller seas, with the ocean covering approximately 71% of Earth’s surface and 90% of the Earth’s biosphere. The ocean contains 97% of Earth’s water, and oceanographers have stated that less than 20% of the World’s Ocean has been mapped. The total volume is approximately 1.35 billion cubic kilometers (320 million cu mi) with an average depth of nearly 3,700 meters (12,100 ft).

SEAS on Wikipedia