Bird island (artifical) at high water

uenue, on April 21, said:

A small artificial bird island near the south-east corner of Neeltje Jans island. It's located just about 100 m offshore Neeltje Jans island and can be reached by foot at low tide (not permitted !). At regular high tide the island surface elevates not more than max. 1 m above sea level. During high tide its dry sand area, apart from the stony rim, measures not more than 20 x 20 m. At spring tide or during autum and spring storms, the island is awashed by the sea exept of little parts of it's stony rim (see attached picture). The u-shaped island consists of an outer rim of big stones while the middle is filled up with sand. The stony rim prevents the islet of erosion.