To the north and the east, it borders the sindicaturas or administrative subdivisions of Costa Rica, Quilá [es] and Emiliano Zapata in the municipality of Culiacán.

It borders the Ensenada de Pabellones [es] lagoon, a Ramsar site,[7] to the west; and the Gulf of California to the south.

[15] The idea of establishing an independent municipality of Eldorado first appeared in the 1970s,[14] but various attempts to achieve this had failed before the movement was rekindled in 2020.

[5] The next largest localities in the municipality are Leopoldo Sánchez Celis and Guadalupe Victoria, which recorded populations of 3411 and 2288 respectively in the 2020 Census.

[19][20] Eldorado's economy relies on agriculture irrigated by the San Lorenzo River; commerce; and fishing, in particular shrimp farming.