Xu, Y. and Cheng, L. 2026. Mid- to Long-Term Runoff Forecasting in the Huaihe River Basin Using a Spatiotemporal Graph Neural Network Coupled with LSTM. Environment, Social and Governance. 3, 3 (May 2026), 1–12. DOI:https://doi.org/10.70267/esg2026.v3n3.0112.