Fig. 1

a Karst Distribution in the Northern Hemisphere; b Location of the SCK; c Satellite imagery of Shibing WHS in 2022; d Satellite imagery of Libo-Huanjiang WHS in 2022

a Karst Distribution in the Northern Hemisphere; b Location of the SCK; c Satellite imagery of Shibing WHS in 2022; d Satellite imagery of Libo-Huanjiang WHS in 2022