Thank you for suggesting an interesting method to create the effect of a hilly terrain.
Your message, for me [with help of Google Translate] is perfectly adequate.
In the above:
It was intended to enable Landscape Contours to be created as accurately as possible, reference:
In this case @ChocolateLover has chosen to simulate the chosen area of a Map by simplifying the details of the Contours. The Contours would have to be traced and spaced accurately vertically to obtain similar detail to the actual Landscape.
To obtain similar results it is necessary to utilise Contours, understanding that using Tools > Loft as the method of creation will require multiple peaks or high points to be created separately.
To explain my method, and quickly, achieve the objective a simple Spline > Fixed Control Points was used to create the largest Contour. Then Transform > Scale + Copy was used to create the other smaller Contours, all of the latter Contours being Selected and spaced vertically using Transform > Move/Rotate. After each move upward the largest Contour is Deselected and this is repeated as necessary:
Using Tools > Loft, in this case starting from the top Contour and working downward.
The reason for this was that starting at the bottom and working up everything was OK until tapping on the sixth Contour, this displayed the message ‘Failed to compute geometry’. When the Loft is complete hide the Sketch Planes as required:
To achieve multiple peaks or high spots follow the above using appropriate Contours, move into position and use Tools > Union as required.