Land cover in the watershed is predominantly agriculture and forest, and large expanses of shrubland and semiarid foothill terrain also occupy portions of the basin in addition to a growing urban percentage. Irrigated land covers 30% of the watershed followed by forested areas in addition to national forest and park land that encompass 26.8% of the total land area. Built-up areas use a much smaller percentage of the watershed, at just 1.9%. In the San Joaquin's direct drainage region (not including the Tulare Basin) agricultural cover was 19.2%, forests embraced 28.4%, and urban areas occupied 2.4% as of 1995. The basin's main population centers are in the north and south and population density generally increases from west to east. In fact, despite the relatively small percentage of developed areas, more than 50% of the population lives in the watershed's four largest cities: Fresno, Bakersfield, Stockton and Modesto.