The document discusses the Mekong River, which is important to local communities for fishing, agriculture, and culture. It describes annual festivals celebrated along the river, including the Water Festival in Cambodia in November, when the river's current reverses direction. Local people traditionally fish using nets and catch various fish species. The river and connected Tonle Sap Lake are vital for food security and local livelihoods in Cambodia, Laos, Thailand, and Vietnam. The area also now supports a tourism industry that brings visitors for cultural events and sights like the Irrawaddy dolphins.