Deuteronomy 3:11

(For only Og king of Bashan had remained of the remnant of the Rephaim. His bed of iron, nine cubits long and four cubits wide, is still in Rabbah of the Ammonites.)

Note Og’s bed was approximately 14 feet long and 6 feet wide (4.3 meters long and 1.8 meters wide).

BSB · Berean Standard Bible
For only Og king of Bashan remained of the remnant of giants; behold, his bedstead was a bedstead of iron; is it not in Rabbath of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man.
KJV · King James Version
(For only Og king of Bashan remained of the remnant of the Rephaim. Behold, his bedstead was a bedstead of iron. Isn’t it in Rabbah of the children of Ammon? Nine cubits was its length, and four cubits its width, after the cubit of a man.)

Note A cubit is the length from the tip of the middle finger to the elbow on a man’s arm, or about 18 inches or 46 centimeters.

WEB · World English Bible
(For only Og king of Bashan remained of the remnant of the Rephaim; behold, his bedstead was a bedstead of iron; is it not in Rabbah of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man.)
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

giants
Genesis 14:5
Rabbath
2 Samuel 12:26; Jeremiah 49:2; Ezekiel 21:20; Amos 1:14
Rabbah
nine cubits.
1 Samuel 17:4; Amos 2:9