1:15 Then they took Jonah and threw him into the sea, and the sea’s raging abated. 16 Struck with great fear of the LORD, the men offered sacrifice and made vows to him. 2:1 But the LORD sent a large fish, that swallowed Jonah; and he remained in the belly of the fish three days and three nights.
Interestingly, many modern translations position Jonah 2:1 as Jonah 1:17, including it with the previous chapter where it makes more sense from a literary point of view. It is good to be reminded that chapters/verses were assigned by Robert Estienne in 1551 for the New Testament and 1571 for the Hebrew Scriptures for his print editions and so chapter/verse is not sacrosanct. But if you read other Bibles and commentaries and are wondering why the verses are “off” by a single digit…now you know.