Islet in Vikern — Örebro County County, Nora Municipality.

Vikern has a digitised depth map based on real soundings. It shows the depths across the whole lake, including the water around Holmen.
View the depth mapWhere does it shelve off around Holmen?
You can see it in Huggtabell's digital depth map for Vikern — real soundings, tap anywhere for the depth, and follow your GPS position out on the water. Solunar, weather and water temperature are included.