I have a world map in the WGS 1984 Geographical Coordinate System. I want to measure the lengths of borders between countries in kilometers. To get the units in meters, I have first used the Define Projection tool and then the Project tool to change to the Robinson Projected Coordinate System. After that, I am using the Intersection tool and setting the output type to "line" to get a Shape_length column where I will have all the borders and their lengths. But, the value in the Shape_length column appears to be wrong as it measures the borders to be only a few meters. The Measure tool does the same thing.
I can't get my head around what I am doing wrong. I've attached a print screen of the data frame. What could the problem be?