PRODUCTION - 12 July 2021, Hessen, Gie?en: Surfers stand at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahn wave" should attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: Surfers jump into the Lahn at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahn wave" to attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: Surfers and a kayaker ride at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahn wave" should attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: Surfers stand at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahn wave" should attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: Surfboards stand at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahn wave" to attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: The initiators of the Lahnwelle, Jan (l-r), Holger, Paul, Jan-Ole and Daniel, stand at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahnwelle" should attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: A man holds a surfboard with the inscription "Lahnwelle" at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahnwelle" should attract surf scene") Photo: Sebastian Gollnow/dpa

PRODUCTION - 12 July 2021, Hessen, Gie?en: Paul Schmidt, co-initiator of the Lahnwelle, paddles at the weir where the surf wave is to be created. (to dpa: "Hesse instead of Hawaii: "Lahnwelle" should attract surf scene") Photo: Sebastian Gollnow/dpa