China.org.cn

China's first subway through karst spring area becomes operational

China's first subway line passing through a karst spring area began operation on Saturday in Jinan city of East China's ...
China.org.cn

Across China: Chinese city expands subway network while protecting its famous springs

An even greater challenge was the city's complex geology, characterized by karst caves, high-strength limestone and aquifers, resulting in the city opening its first subway line much later than many ...
大江网

China first subway through karst spring area becomes operational

JINAN -- China's first subway line passing through a karst spring area began operation on Saturday in Jinan city of East ...