The watershed is the preferred unit because it is visible on the ground and because water connects everything inside it. Bioregional mapping starts with where rain falls and flows, then layers soils, vegetation, and Indigenous territories over the political map (Aberley, 1993). The purpose of the map is to show how little political boundaries correspond to ecological ones.

Reinhabitation is the word for learning to live in a place as if you meant to stay (Berg and Dasmann, 1977): restoring what is damaged, fitting livelihoods to what the land sustains, building culture from the particulars of the region. It rejects both wilderness preservation, which removes people, and conventional development, which ignores place. The timescale is generations, which ties it to regenerative systems and their concern with a place's capacity to keep renewing itself.

Bioregionalism holds that those who have lived longest in a place, human or otherwise, carry knowledge no outside expertise replaces. That has drawn it toward Indigenous land practice, not always carefully, and toward the traditional ecological knowledge catalogued under Lo-TEK. It also explains the movement's preference for commons-based design: forests, fisheries, and watersheds are managed better by those who depend on them than by owners who do not.

Bioregional design at the studio scale uses the region as its material catalogue. In the Rhône delta that has meant wall panels pressed from sunflower stalks, tiles crystallised from Camargue salt, and bioplastics cast from algae, all sourced within a day's drive of Arles (Atelier LUMA, since 2016). Ceramics fired from the clay of named fields, and glass melted from sands collected in more than 80 countries for To See a World in a Grain of Sand (2017), make the same point through soil: the colour and the imperfections come from the place (Atelier NL). Straw, hemp, and regionally grown timber form the palette argued for in Material Reform (Material Cultures, 2022), along with the case that the palette does not exist until the regional supply chain is rebuilt to carry it. Each is a demonstration that a material's origin can be read in the finished object. The limit is throughput: a salt tile or a sunflower panel is made in tens, not thousands.

At building scale, bioregionalism appears as rammed earth from the excavated site, timber from a mill within a hundred kilometres, stone from a regional quarry, and vernacular forms fitted to local climate. Story of Place, a method that precedes design with a study of how a site's geology, ecology, and human history have shaped each other, exists so that a project extends those patterns instead of interrupting them (Regenesis Group). This overlaps with distributed manufacturing in its reliance on small regional producers, and with peripheral technology in its interest in tools developed outside industrial centres. The argument is that regional supply chains, more than regional styles, are what make architecture belong to a place.