Ancient History

prehistoric

Though a quick search says we've likely had at least makeshift boats for as long as 50 to 60 thousand years so kinda broad span if 3000 bc is the first written history(egyptians, 5k years)

If the monument was built around 5 thousand years ago i guess the timeline suggests there were more advanced boats earlier than we thought, so that's kinda cool

There's a link in the post that will help you access the full article.

Concerning your question, I think the answer would be in the following segment:

“The Matarrubilla stone basin is a good piece of indirect evidence, which, in our opinion, proves that these people had advanced raft, canoe or sailing-boat technology.”

For details, here is the paper.