Ilha do Corvo is the northernmost member of the Azores, the mid-Atlantic archipelago stretching west from Portugal. It is home to four or five hundred people, some stone windmills, a huge extinct volcano, and, to judge by the name, crows. Corvo and its hydrangea-speckled neighbour Flores are so far out from the European mainland that they actually rest on the North American Plate. Consequently they are edging away from the rest of the country by several millimetres each year. Already Corvo is a few miles closer to St.John's, Newfoundland, than to Lisbon.