This study explored the potential of using waste aqua net from aqua-culture ponds as a reinforcing material embedded in geopolymer clay. Various tests, including unconfined compressive strength (UCS) and California bearing ratio (CBR), were conducted on clayey soil treated with geopolymer (using a 4 molarity NaOH solution and a Na2SiO3/NaOH ratio of 1) and different percentages of palm oil fuel ash (5, 10, 15, and 20% by dry weight of soil). The results demonstrated that adding the precursor improved the UCS and CBR of the soil up to 15% of the precursor, beyond which the strength decreased. Additionally, the CBR of the expansive clay subgrade was determined in the laboratory by stabilizing it with a cushion of palm oil fuel ash-based geopolymer clay embedded with an aqua net. The study found that the role of aqua net in geopolymer clay is more significant than in unreinforced treated clay. The inclusion of aqua net within the treated clay increased peak axial stress enhanced residual strength, boosted the modulus of elasticity and toughness, and transformed the treated clay's failure mode from entirely brittle to ductile.