What determines size of the electoral district or riding?

The size of an electoral district or riding is primarily determined by population, geographical features, and administrative considerations. Electoral commissions aim to create districts with roughly equal populations to ensure fair representation, while also considering natural boundaries, urban versus rural areas, and existing political boundaries. Additionally, logistical factors such as accessibility and community interests can influence the final size and shape of a riding. Ultimately, the goal is to balance representation with practical governance.