Here's why:
* Direction: "Northern" simply indicates a direction or position towards the north. It doesn't inherently have a positive or negative connotation.
* Comparative/Superlative: Comparatives and superlatives are used to compare things or qualities. You can't compare directions in the same way you compare size, speed, or quality.
Alternatives:
If you're trying to express a positive aspect related to a northern location, you could use other adjectives or phrases like:
* More northerly: This emphasizes the direction.
* Further north: This emphasizes distance.
* More scenic: Describes a positive aspect of a northern location.
* More tranquil: Another positive aspect of a northern location.
Ultimately, the best way to describe a positive aspect of something "northern" depends on the specific context you're using it in.