Last weekend I visited a short nature trail in Kotka, on the shore of the Gulf of Finland. The trail is marked with white markers and has poles showing some notable spots. The other trail goes in the forest, both are 2,5 kilometers long.
The open sea starts from Mussalo and in the south in about 100 kilometers is Estonian shore. It is said that on a clear day you can see all the way to Haapasaari island that belongs to Russia.