Longest submarine mountain range

According to Official Guinness Records,

The longest submarine mountain range is the Mid-Ocean Ridge, extending 65,000 km (40,000 miles) from the Arctic Ocean to the Atlantic Ocean, around Africa, Asia and Australia, and under the Pacific Ocean to the west coast of North America. It has a greatest height of 4,200 m (13,800 ft) above the base ocean depth.

For a complete list of Unknown date records, please visit Unknown date Guinness Records in United Kingdom.

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