"Vatten" is the Swedish word for water. The cache is located at Vassfjellet which translates to "The wet mountain" or "water mountain".
The mountain peak is 711 meters above sea level. You can go up to the top from different sides. I recommend you start by Tanem school Klæbu and follow well-trodden paths and gravel roads all the way to the top. Depending on which path you choose is the distance 7-8 km.
On top of the mountain there is a television mast that can be seen from many parts of the Trondheim area. It is 220 meters high.
Have a nice trip