Majha
The partition split the Punjab Province (British India) into the two states of West Punjab (Punjab, Pakistan) and East Punjab. However, the historic Majha region is arguably still the same as before since the partition does not change the previous history of Punjab, therefore does not change the geography of the Majha region of the historic Punjab region.
Punjab
The older definition of the Punjab region focuses on the collapse of the Sikh Empire and the creation of the British Punjab province between 1846 and 1849. According to this definition, the Punjab region incorporates, in Pakistan, Azad Kashmir including Bhimber and Mirpur and parts of Khyber Pakhtunkhwa (especially Peshawar known in the Punjab region as Pishore). In India the wider definition includes parts of Delhi and Jammu Division.