The seven research sites were established as a connected material network across Vietnam rather than a set of isolated sampling points. Spanning roughly from 21° to 10° latitude, they trace a north-south geographic arc through diverse climate zones, soil conditions, fiber sources, biopolymers, and cultural landscapes.
Each location was selected based on seven criteria: soil diversity across climate zones; links to current or future arb architects projects; ecological and geological value; cultural significance; potential for earthen construction; sufficient soil reserves for pilot production; and local accessibility for fieldwork and collaboration. Together, the sites offer a range of ecological and geological conditions, proximity to culturally significant communities, and the presence of networks that can support long-term fieldwork, sampling, and collaboration.