1.7 million people have migrated out of Vietnam's agriculturally productive Mekong Delta over the last 10 years. Crop yields have fallen in the region, and rising levels of salt water and freshwater droughts are to blame. Sea level rise and other climate-related factors have contributed to the Mekong Delta's decline. The Vietnamese Mekong Delta is one of Earth’s most agriculturally productive regions and is of global importance for its exports of rice, shrimp, and fruit.