The big tree near Nagykáta Traditional Cache

This tree was planted by my grandfather, about 1930. There is a thermal bath near it.

It's perimeter is more than 5.5 meters, at least four people would be needed to round it.
The password is about 1 km far from the tree, on an another tree: when was "Petya" here?
The thermal bath (N 47 24.233, E 19 44.457) is opened from May to September, 9 to 18 (19) hours, the water is good for bones and joints