The concept of 'regionness' refers to the degree of shared identity, institutionalization, and cohesion within a geographical area. South Asia, despite its geographical contiguity and shared cultural heritage, exhibits a notable lack of 'regionness' due to several deep-seated factors.

Firstly, historical animosities, particularly between India and Pakistan, have been a persistent impediment. The unresolved Kashmir issue, cross-border terrorism, and a history of conflicts have prevented meaningful cooperation and trust-building. This bilateral tension often spills over, hindering regional initiatives.

Secondly, the India-centric geography and economy of the region create an imbalance. India, being significantly larger in terms of size, population, and economy, is often perceived by smaller neighbors as a dominant power, leading to anxieties and reluctance to fully integrate regionally. This asymmetry can foster a sense of dependence rather than equal partnership.

Thirdly, internal political instability and ethnic conflicts within individual South Asian nations (e.g., Sri Lanka's civil war, Nepal's Maoist insurgency, ethnic issues in Pakistan and Bangladesh) often spill across borders, creating refugee crises, security concerns, and diverting national resources away from regional cooperation efforts.

Fourthly, the South Asian Association for Regional Cooperation (SAARC), the primary regional institution, has largely been ineffective. Its progress is frequently stalled by bilateral disputes, particularly between India and Pakistan, and a lack of consensus on key issues. This institutional weakness prevents the development of robust regional frameworks for economic, social, and political integration.

Finally, differing political systems, economic disparities, and the influence of external powers (like China and the US) further complicate regional cohesion. These factors collectively contribute to a fragmented South Asia, where 'regionness' remains an aspiration rather than a reality.