The earliest indigenous populations of Punjab are rooted in communities and sub-groups of the Indus Valley Civilisation, which existed along the Indus River (and its tributaries) over 5000 years ago. These rivers form the map of the modern Punjab region. These societies were agricultural and adapted to riverine landscapes - seasonal flooding, heat, aridity. They are often described incorrectly as a vanished or replaced civilisation, however, in reality the populations persisted beyond the decline of the Harappa Civilisation and continued to inhabit the Punjab region.

The Indus Valley-derived populations were shaped by long term exposure to a warm, semi-arid climate, intensive agriculture, and dense settlement. Over time and generations, these conditions impacted evolution and contributed to the physical traits of the population - favouring heat regulation, outdoor labour, and environmental extremes. The communities form the foundational ancestral layer of modern Punjabi populations, establishing the baseline upon which sub-groups and external influence developed.

Alongside the Indus Valley Civilisation, the Punjab region was also inhabited by a number of smaller indigenous communities that existed before, with, and after the Harappan society.

These communities lived in villages located across plains and semi-rural zones, existing both independently and in synergy with the urbanised Harappan Civilisation. They are sometimes categorised under later historical/ cultural labels, but they represent a plethora of local populations rather than distinct groups.

Seperate from (and following the decline of) larger urban centres, other indigenous populations reorganised into village based communities. They adapted to shifting river courses, changes in urban infrastructure, and variable local environments. This created greater regional differentiation than what existed in the Indus Valley Civilisation.

Unlike the relatively standardised conditions of the Indus Valley, these indigenous communities experienced more environmental variation, which contributed to greater physical diversity across Punjab’s populations.

While other indigenous populations of Punjab existed under similar environmental and climatic conditions, communities that lived across the plateaus, and foothill zones experienced geographic divergence that shaped them differently over time. These communities developed in direct response to variations in altitude, terrain, and temperature.

The plateau and foothill populations were shaped by cooler temperatures, uneven terrain, and variable rainfall, while the plains experienced heat, open agricultural landscapes, and greater dust/ sun exposure. These contrasting environments influenced patterns of mobility, labour, and survival, contributing to differences in physical traits between sub-groups.

It is important to note that this variation emerged within the Punjab region, independent of later migrations and political rule.

Indo-Aryans were early Indo-European pastoral and agricultual groups who gradually spread across northern South-Asia after the fall of the Indus Valley Civilisation.

They interacted with native populations across the central and eastern Punjab region.

The interactions were both high in volume, and over a long term period. Settlement occurred over centuries, with long term cultural integration.

The traits and features from this group overlap heavily with those of the Indus Valley Civilisation itself and are not distinct on their own.

These groups were Central Asian, Steppe origin populations who moved into South Asia. Some established regional rule.

They entered Punjab through the north-west of the region, and had the strongest presence in the north-west and centre of the region.

They had a moderate to high intensity of interaction with native populations. They settled locally over multiple generations and assimilated greatly with existing communities.

This non-indigenous population is often linked to increased height in some indigenous groups. Additionally, sharper facial structures, deeper-set eyes, and lighter skin tones are associated with regions where their settlement was dense.

Iranian origin populations interacted with the Punjab region through imperial administration, trade, and limited settlement over time.

Their interactions were strongest in the western Punjab region and in urban centres, specifically those along trade and administrative routes.

There was a moderate intensity of interaction - settlement did occur, but the non-indigenous influence was concentrated in urban and elite populations rather than in mass rural groups.

The traits associated with this group are narrower facial features, prominent nasal bridges, and wavy- curly hair textures They are unevenly distributed across the Punjab region.

Pashtuns are an ethnolinguistic group originating from the mountainous regions to the west of the Punjab region. They have a long-standing historical movement into the region.

They settled primarily in the west of the Punjab region.

There was high intensity of interaction between the Pashtun groups and indigenous Punjabi groups. Many Pashtun groups settled permanently into Punjab through land grants, military service, and agriculture. This led to extensive intermarriage over generations.

The traits associated with this group are taller stature, broad builds, defined bone structure, dark hair, and are most visible in western Punjabi populations.

Turkic populations originated in Central Asia and entered Punjab as soliders, administrators, and settlers.

Their settlement was concentrated in fertile plains, towns, and urban centres across Punjab.

They had a moderate to high intensity of interaction with indigenous populations. The ruling elites were limited in number, however the non-elite settlers integrated locally and intermarried pre-existing groups.

This group is linked to mixed features combining Central Asian and South Asian characteristics.

Arab populations reached the Punjab region primarily as traders, scholars, and small settler groups related to the expansion of Islamic trade networks.

Interactions between populations occurred mainly in urban centres and along trade routes. There was minimal crossover between rural Punjabi groups and Arab populations.

Contact was generally commercial and cultural, with limited long term crossover between the groups.

Genetic impact is minor and/ or localised. Despite similar traits existing in both Arab and Punjabi populations, their spread and introduction are not attributed to the crossover between the groups.