A map from 1920 of Asia showing principal physical features and natural regions. The map is color-coded to show lands below sea level, lowlands, uplands and plateaus, the older, worn down mountains, and younger, rugged mountains. The map shows river and lake systems, and water depths at the 100, 1000, and 2000 fathom lines. Comparative latitudes for other natural features in the world are given in the side margins, and an outline map of California at the same map scale is given to show relative area size.