The great Mapimi desert of western Coahuila is another lacustrine depression, but only marshy lagoons remain.
Later it became the province of Nueva Estremadura under the Spanish regime, and in 1824, under the new republican organization, it became the state of Coahuila and included Texas and Nuevo Leon.
Stock-raising was for a time the principal industry, but agriculture has been largely developed in several localities, among the chief products of which are cotton - Coahuila is the principal cotton-producing state in Mexico - Indian corn, wheat, beans, sugar and grapes.
Chrysoprase, mined near Porterville and near Visalia (Tulare county), is used partly for gems, but more largely (like the vesuvianite found near Exeter, in the same county) for mosaic work; and there are ledges of fine rose quartz in the Coahuila mountains of Riverside county and near Lemon Cove, Tulare county.
Southward the altitude falls, Death valley and Coahuila valley being in part below the level of the sea.