Jonah 3:2-4

Amplified Bible

²“Go to Nineveh the great city and declare to it the message which I am going to tell you.” ³So Jonah went to Nineveh in accordance with the word of the Lord. Now Nineveh was an exceedingly great city, a ^[a]three days’ walk [about sixty miles in circumference]. ⁴Then on the first day’s walk, Jonah ^[b]began to go through the city, and he called out and said, “Forty days more [remain] and [then] Nineveh will be overthrown!”

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Footnotes

Jonah 3:3 It is usually assumed that the “three days’ walk” was the distance equal to the circumference of the walled city, but it would also include the open fields, farms, and villages that would have been considered the territory of Nineveh. In fact, a significant portion of what was considered an ancient city’s population typically were farmers who lived outside the city, and only left their farms for the protection of the city when an invading army threatened to attack. For another explanation of the distance, see note v 4.
Jonah 3:4 Even though it probably would not have taken Jonah long merely to walk from one end of the city to another, to reach the entire population of more than 120,000, Jonah undoubtedly had to work his way through countless streets and alleys. The term “day’s walk” here and in v 3 does not occur elsewhere in Scripture, so perhaps it refers to the time required to visit every part of the city rather than to walk the circumference (see note v 3).