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While the river of life glides along smoothly, it remains the same river; only the landscape on either bank seems to change.

Most of the Amazon basin is as flat as a pancake and laced with extravagantly meandering waterways. One school of thought holds that more than 145 million years ago, when Africa and South America were joined, the Amazon's main stem was connected to the Niger River and actually flowed in the opposite direction, toward the Pacific Ocean.

Flying over New Orleans on our approach, I got it. There was no view of land without water - water in the great looming form of Lake Pontchartrain, water cutting through in tributaries, water flowing beside a long stretch of highway, water just - everywhere.

We emphasise the features on satellite maps by adding colours to farmland, urban structures, archaeological sites, vegetation and water.

In the 1960s, I personally lived the resounding impact of President Nasser's vision of constructing Aswan's High Dam as a 'national project' for controlling the Nile irrigation and the production of electricity.

There's even an aircraft sensor system that sends down hundreds of thousands of pulses of light measured at different return rates. It allows you to literally strip away vegetation and see entire cities beneath the rain forest canopy. This is the unbelievable future of archaeology.

Before doing fieldwork in Middle Egypt, I analyzed satellite imagery to determine exactly where I wanted to go. Within three weeks, I found about 70 sites. If I had approached this as a traditional foot survey, it would have taken me three and a half years.