River with two semicircular structures on either side
https://social.v.st/system/media_attachments/files/111/073/766/134/888/931/original/b7261d199b427f47.jpeg
Two enormous flood control barriers swing closed to stop a storm surge on the Maes river from inundating Rotterdam: https://www.rijkswaterstaat.nl/nieuws/archief/2023/09/jaarlijkse-functioneringssluiting-maeslantkering-16-september-2023
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