Aerial photography by skycam.ee / Jaan Kronberg

Kostivere is the best-known Karst region in Estonia and the biggest in Harjumaa (its total area is 125 hectares).A large region with the total area of 16 hectares is under state protection. That part of the Karst region is also the most interesting one.

In the Karst region, the Jõelähtme River goes underground near the Kostivere settlement and comes up again near an old bridge in Jõelähtme. Near the river's underground course interesting limestone Karst formations such as open cracks, Karst ditches, funnels, and valleys up to 5 meters deep, can be found.Here are also small caves, the largest of them is Karjakelder that is 6 meters long, 4 meters wide and 2.5 meters high. The bottom of the grotto is always covered with water. Here is also one Karst bridge and peculiar residual rocks known as "stone mushrooms" in the Karst region.