The Harrowlands is divided into three main geological subdivisions: the highlands & islands, the lowlands, and the uplands.
Most of the Harrowlands is lowlands, being flat, low-lying land that makes for very fertile, arable farmland. The lowlands make up most of central Harrow, while coastal lowland areas have been mostly drained.
Highlands and Islands
The highlands & islands encompass virtually all of the western coastline and the far north. There are over 790 islands in Harrow, divided into four main groups: the St Cadogan Isles, the Rothwick Isles, the Inner Windies, and the Outer Windies.
The uplands are in the southernmost regions of Harrow, consisting of a range of hills interspersed with broad valleys and plains.