This analysis examines the definition of space, as manifested in territories and lands, in a postcolonial context of marginality and exclusion. The selected works pay particular attention to the problematic sense of belonging to a land, and to frontiers that are not clearly delimited and stable. As regards the contexts of the West Indies and Acadia described by Derek Walcott, Édouard Glissant and Antonine Maillet, this is particularly difficult, to varying degrees, owing to the slave trade and its consequences in the Americas, on the one hand, and to the Great Upheaval, on the other hand. A few solutions emerge, such as the development of particular strategies that aim to recover the land or, where this is not possible or is no longer defined as desirable, to imagine new relationship between human beings and their chosen land.