This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Seawalls. University of Barcelona Spain en Oikosteam en Convert to SVG Oikosteam original upload log page en Seawalls Oikosteam bytes no of Barcelona Spain Seawalls Transport infrastructure
Page 2023 Free-images.com. All images are Public Domain