Diemen sits where three waterways cross. The little Diem itself runs south to north through the middle of town. The Weespertrekvaart, a 17th-century barge canal that once carried freight between Amsterdam and Weesp, cuts in from the west. The Amsterdam-Rhine Canal - one of the busiest commercial waterways in Europe, six lanes of barges nosing toward the Rhine - forms the town's northern edge. The intersection is not picturesque so much as functional. The waterways defined where the town could grow and how. Diemen developed in three neighborhoods because the canals and railway lines drew the lines. Diemen Noord clings to the south bank of the Amsterdam-Rhine Canal. Diemen Centrum holds the town hall and the older streets. Diemen Zuid grew up around the metro station, full of apartment blocks built for people who work in Amsterdam and sleep here.

On a map Diemen looks like a town being slowly digested by its larger neighbor. To the west: Amsterdam-Oost. To the south: the Bijlmer and Duivendrecht. To the east, just barely, the empty Overdiemerpolder before the historic fortress town of Muiden. The A1 motorway and the A9 cut across the municipality. The A10 ring road skirts it. Two NS train stations and a metro line stitch it into the Amsterdam transit grid. And yet Diemen, population about 26,000, has held on to its own municipal identity through every wave of Amsterdam expansion - through Bijlmermeer in the 1960s, through IJburg in the 2000s, through the steady eastward push of the metropolitan region. The boundary is administrative rather than visual. Driving from Watergraafsmeer into Diemen Centrum, you cross under the A10 and the buildings look basically the same. Only the road signs change.

What gives Diemen its character is mostly what is not built. The Diemerpolder on the east side of Diemen Noord still farms cattle. The Diemerbos, planted in the 1990s as part of a regional reforestation project, is now a fifty-hectare wood of birch and willow and oak where Amsterdam families come to walk their dogs. The Diemervijfhoek, a green pentagon between the canal and the river, runs wilder. At the northeast corner of the municipality the Diemen Power Station - a gas-fired plant with cooling towers visible from the A1 - has been generating electricity since the 1960s. The mix is characteristically Dutch: working land, restored woodland, heavy infrastructure and dense housing, all packed into the same eight square kilometers without any of them quite getting in each other's way.

Diemen has produced more notable footballers per capita than is strictly reasonable. Daley Blind, born in Amsterdam in 1990 but raised here, plays for AFC Ajax with over 300 club caps and more than one hundred appearances for the Dutch national team. Adam Maher and Junas Naciri came up through the same streets. The track cyclist Levi Heimans competed at the 2004 Olympics. The road cyclist Riejanne Markus became a Dutch national champion. But the town's most unusual native lived more than two centuries earlier. Pieter Nieuwland was born in the Diemermeer in 1764 and died in 1794 at the age of thirty - a Dutch mathematician, chemist, nautical scientist and poet, the kind of polymath the Enlightenment briefly made plausible. He was a professor at Leiden by his twenties. Had he lived longer, the Netherlands might have remembered him the way it remembers Christiaan Huygens. Instead he is a marker on a town's list of names, born here, and a reminder that the small places sometimes produce the unusual ones.

There are no secondary schools in Diemen. Teenagers ride trains to Amsterdam or Weesp every morning. There are two universities of applied sciences in Diemen Zuid - HBO Nederland and Inholland - but the research universities are in Amsterdam too. The town is, by some functional measure, dependent on its larger neighbor. And yet it has its own mayor, its own twenty-one-seat council, its own coalition negotiations after every election, its own argument every few years about whether to fight an Amsterdam annexation proposal or to ignore it. The argument has been settled the same way for decades now. Diemen stays Diemen. The water keeps its name. The Diem keeps flowing north between Amsterdam-Oost and Bijlmer, doing what rivers do.