Marginal lands are areas of land that are less productive than other areas due to factors such as poor soil quality, low rainfall, or extreme temperatures. These areas are often located on the fringes of deserts and are particularly vulnerable to desertification. Desertification is the process by which land becomes desert, typically due to a combination of climate change and human activities such as overgrazing and deforestation. Marginal lands are more likely to experience desertification because they are already in a fragile state and are more susceptible to the effects of climate change and human activities.