We went for a walk in another bog, with my father and his wife (on the Riisa hiking trail in Soomaa bog).

The path passed right by several small pools with platforms that made it easy to climb into and out of the water, so we tried out the water.

Bog pool water is brown like Coca-Cola.

Given how small the pools were I had expected them to be warm from the sun, but the water was quite shockingly cold. Only a very thin layer at the top was warm. If I swam very carefully, almost gliding without moving my arms, I could keep in the warm layer. But then I turned back and swam through water that I had churned up with my legs, and it was cold again.