Which country has no laws?

Because countries are legal entities, a country can not exist with no laws. Also, there are international laws which every country is expected to abide. A land without laws would probably be uninhabited.

Every human has their own rules such as:

Don't kill me

Don't take my stuff

Mutually accepted understandings become rules and rules become laws or societal norms.

Even in an undeveloped tribe, that tribe would have expectations for how you should behave. Any expectation with a punishment would then be law. For example: If you kill my goat I'll kill yours and take another for myself. If you don't let me, the tribe will kill you.