The northern areas of the Shire's Northfarthing are nowhere mapped in detail, so some elements of this map are necessarily conjectural. In particular, the location of the river Norbourn and the Greenfields region are based entirely on textual descriptions. The upper course of the Water is also unknown (it is assumed here that it had its sources in the slopes of the Hills of Evendim) and the northern extent of Bindbole Wood is not definitively established.