Pentala is unique as an island in that it has a lake. It is the southernmost lake in Espoo, and it has a small island in the middle.

The lake Pentalanjärvi is about one hectare in size, and it appears to be in the natural state of a wilderness lake. The cliffs rising around it have sweeping views of the island. The forests surrounding the lake are mostly included in the nature reserve.

The south-western shoreline of the lake is overgrown wetland dominated by reeds and growing dense stands of horsetail and reed. The bog provides a favourable habitat for some rare species of moss.

Follow the nature trail to experience Pentala’s archipelago nature and Lake Pentalanjärvi. The trail begins from the museum area.