San Ignacio Río Muerto is a municipality in the state of Sonora in north-western Mexico.

[1] The municipal seat is at San Ignacio Río Muerto.

The municipal area is 1,144.00 km2 with a population of 13,692 registered in 2000.

Neighboring municipalities are: Its western and southeastern boundaries are with the Gulf of California.

This article about a location in the Mexican state of Sonora is a stub.