Key to numbered sections of Part I (Sites Explored).

Please note that only the most significant sites and discoveries for each region are included here; for further information see the supplementary material for each region available at https://doi.org/10.1017/S0068113X21000337; https://doi.org/10.1017/S0068113X21000350; https://doi.org/10.1017/10.1017/S0068113X21000362; https://doi.org/10.1017/10.1017/S0068113X21000374; https://doi.org/10.1017/S0068113X21000386; https://doi.org/10.1017/S0068113X21000398; https://doi.org/10.1017/S0068113X21000404; https://doi.org/10.1017/S0068113X21000416; https://doi.org/10.1017/S0068113X21000428; https://doi.org/10.1017/S0068113X2100043X.
No reports received.