Interesting issue.
With Orbx OpenLC North America enabled the airport has no cliffs at its edge, but, the odd terrain issues are around.
With Orbx OpenLC North America disabled and Freemesh North America enabled there are cliffs next to the runway, but, the odd terrain issues are gone.
With both enabled the cliffs are next to the runway, but, the odd terrains issues are gone.
I took a look at CEX4 via Google Earth. The really airport is located on the side of the road toward the river, while in the sim it is located on the opposite side of the road. GoogleEarth does show cliffs/ridges close to where the sim airport is located. I bet if the airport were moved to the correct side of the road the "cliffs" would change to ridges/hills. I believe the cliffs are caused by the flattening of the airport bgl.
Is CEX4 a Misty generated airport?
Danny
Danny