The Koi Nation, a federally recognized tribe based in Sonoma County, unveiled plans Wednesday to turn a 68-acre vineyard southeast of Windsor into a $600 million casino resort, one of the largest of its kind in Northern California.

The 90-member Pomo tribe intends to turn the land about a half-mile from Shiloh Ranch Regional Park into the Shiloh Resort & Casino. Pending necessary state and federal approvals, it’s likely to take four years before the resort would be built and opened, tribal representatives said.