How Bogs Made for Borderlands: The Eastern Low Countries, c. 670 – c. 1900 ce

Scholars have radically turned away from the notion of ‘natural borders’ dictated by nature and now broadly agree that all borders are ‘artificial’ human constructs. However, there is a need to revisit environmental determinism in its nuances. We analyse the relation between distinct natural features and historical border development, using the notion of affordances and the example of raised bogs in the medieval and modern-period eastern Low Countries. For humans, bog landscapes in these periods functioned as both barriers and passageways through the spatiotemporal variability of these opposite affordances. At the scale of local settlement territories, large bog landscapes had the coercive agency to function as borderlands separating adjacent communities. Such coercion was absent on the larger spatial scale of princedoms. The growing economic importance of peat was a crucial driver for border demarcation at both scales from the late Middle Ages. Diplomatic risk calculation and path dependency explain the spatial concurrence and long persistence respectively of bog boundaries between successive polities.