El Arenal is a town and municipality in the state of Jalisco in central-western Mexico. El Arenal is known as the gateway to the so-called "…El Arenal is a town and municipality in the state of Jalisco in central-western Mexico. El Arenal is known as the gateway to the so-called "blue agave" region in the Jaliscan Highlands. The municipality has an area of approximately 111.8 square kilometres.