The ancient Greek world consisted of approximately 1,000 autonomous polities scattered across the Mediterranean basin and was remarkable for both its diversity and its uniformity. As Greeks dispersed throughout the Mediterranean, the different environmental and human ecosystems they encountered created important differences among widely scattered settlements: each Greek community developed its own unique set of socio-political institutions and social practices. Nonetheless, despite their dispersal and diversity, Greek communities were bound together by a network of commercial, cultural, diplomatic, and military ties and shared important commonalities, most notably language and religion.