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Bangladesh has far and away the highest population density of any sizable nation — around 3,000 people per square mile pack the alluvial plain that spans most of the country.

Three years after seizing control of the great alluvial plains of the Tigris and Euphrates, Islamic State, which has claimed so many victims in north-western Iraq, Syria and beyond, is finally dying.

For microbes, the body is a vast continent comprising many environments: deserts, fertile riverbeds, alluvial plains, bayous and forests.

Basic sanitation and drainage has been a historic problem in this swampy city built over ocean-level alluvial plains at the forested mountains.

One set appears topographic, with what could be ridges, valleys and alluvial plains; this series also offers a sense of motion and even violence, complete with raw tears in the plastic skin.