There is beautiful nature around Sundbymaren. A peomenad around the lake is recommended, there are fertile meadows with orchids and centuries-old oaks interspersed with extensive outcrops, high cliffs that dramatically plunge down to the surface of the cozy water and pastures with grazing cattle. In addition, one must not forget that the reserve stretches out towards Huvudskär with many barren sea band skerries that have been shaped by ice and waves over millennia into smooth undulating rocks that invite rock bathing.nnFinally, Södermanland's deepest lake Stunnträsk is located here, perhaps worth a visit even if it is difficult to see that the insignificant forest star is a full 40.9 meters deep.nnInside the nature reserve is also the ruin of the first manor building on Ornö, which was ravaged by fire by the Russians in 1719