They self-admittedly have a unique set of resources.

Natural Resources Fresno County is unique among California counties in the range of natural resources (forests, riverways, and wildlife habitats) that encompass its vast terrain.... Two major rivers, the Kings and San Joaquin, flow through this rich landscape, providing the County with its most prized resource, water.[0]

[0] -https://www.co.fresno.ca.us/departments/public-works-plannin...