Most of it seemed fertile, however, most will probably say the Mekong Delta. But that region is extremely wet (seemingly flooded).
the praries
The most common food in Vietnam is Sea food:)
Fertile Crescent.
The fertile silt made the land ideal for farming.
In fertile river valleys.
because of fertile region
the praries
The Midwest region of the United States, often referred to as the Corn Belt, has some of the most fertile soils in the country. The rich soils in this region, consisting of deep layers of glacial till and loess, are ideal for growing a variety of crops, particularly corn and soybeans. The region's fertile soils have made it a key agricultural area in the country.
north central
The Amazon Rainforest has some of the most fertile soil in Brazil. In addition, it has the most mineral resources.
The most fertile part of Egypt - see the link below.
most probably Hai Phong
The most common food in Vietnam is Sea food:)
There are many areas of particularly fertile land in Australia, but the greatest area and concentration is found in the southeastern quadrant of the continent. In addition, the entire eastern seaboard is fertile, as is the far southwest of the continent.
The Delta in the state of Mississippi runs from the Gulf coast north to State Line Rd. on the southern edge of Memphis, Tennessee, and as far from the river as the flood plain extends. This entire region is extremely fertile.
Most of Georgia's agricultural products come from the Coastal Plain region in the southern part of the state. This region has a favorable climate and fertile soil, making it ideal for growing a variety of crops such as peanuts, pecans, and peaches.
Most fertile is the superlative for fertile.