Iraqi Kurdistan, also known as the Kurdistan Region is an autonomous region in Northern Iraq. The regional capital is Erbil. The region is officially governed by the Kurdistan Regional Government(KRG). Iraqi Kurdistan is part of the Kurdistan geo-cultural region.
Citizens of the EU, the US, Canada, Japan, Australia, Pakistan and Iran are given a free stamp on arrival. This is valid for 15 days after your arrival. For extensions you will have to report to the Residency Office within 15 days of your arrival. This involves many forms to fill out, around $30 USD in fees as well as a compulsory blood test to check for Hep C and HIV. Be prepared to wait for around 2-3 hours throughout this whole process. Most other nationalities must produce a valid "Iraq - Kurdistan Region" visa on arrival.
Border control at land borders is fairly strict. If you have a contact in Kurdistan, come armed with their name and address. If you don't, make sure you have a very good idea of what exactly you will be doing and where you will be staying. You are also more likely to get in if travelling with someone else, and if you are well-dressed.