Much of Nazirpur is low wetland that stays under water for months each year. Rather than leave it idle, farmers here have for generations piled up water hyacinth and other aquatic plants into long floating beds — called dhap or baira — and grown vegetables and seedlings on them as the water rises and falls.
The beds are rafts of rotting plants, a metre or more thick, topped with small balls of soil in which seeds are sown. Seedlings, gourds, okra, leafy greens and spices grow on them, and when the water recedes the beds become compost for the fields. Bangladesh’s floating-garden farming has been recognised by the FAO as a Globally Important Agricultural Heritage System.
For a visitor, the sight of green fields floating on dark water, worked from small boats, is one of the most remarkable in the delta.