गंगा में मिलने से पूर्व कौनसी नदी स्वयं डेल्टा का निर्माण करती है ? - Which river itself forms a delta before joining the Ganges? - Ganga Me Milne Se Poorv Kaunsi Nadi Swayam Delta Ka Nirmann Karti Hai ? Bihar Gk in hindi, Drainage System Kosi question answers in hindi pdf Son questions in hindi, Know About Kamla Bihar Gk online test Bihar Gk notes in hindi quiz book Gandak