Houghton Mifflin Social Studies lists the four regions of California as: the Coast, the Central Valley, the Mountains and the Deserts. The regions are separated by their different land features.
According to Houghton Mifflin Social Studies, the north of the Coast region of California has thick forests due to its wet, cool climate. The south of the Coast region has a warm, sunny climate. The Central Valley region has a hot, dry climate in the summer and a cool, wet climate in the winter. It has good farmland, productive for growing nuts and vegetables. The Mountains region covers half of California and, just like its name suggests, contains many mountain ranges including the Sierra Nevada. Finally, the Deserts region has an extremely dry and hot climate and houses a myriad of plants, animals and tribes of people.