The Alto Golfo y Delta ("Upper Gulf and Delta") biosphere reserve encompasses is in the northwest of Sonora and northeast of Baja California Norte at the northernmost part of the Gulf of California and the delta of the Colorado River. The area is home to a very large number of marine species. There are also rocky beaches along with those with fine sand. Some of these are home to groups of seals and sea lions. The reserve was created in 1993 and encompasses an area of 934,756 hectares. On land, there are arid scrub brush, coastal dunes and an estuary. It extends into the far upper part of the Gulf of California.
The Alto Golfo y Delta ("Upper Gulf and Delta") biosphere reserve encompasses is in the northwest of Sonora and northeast of Baja California Norte at the northernmost part of the Gulf of California and the delta of the Colorado River. The area is home to a very large number of marine species. There are also rocky beaches along with those with fine sand. Some of these are home to groups of seals and sea lions. The reserve was created in 1993 and encompasses an area of 934,756 hectares. On land, there are arid: scrub brush, coastal dunes and an estuary. It extends into the far upper part of the Gulf of California.