Explanation:

The river Yamuna, a major tributary of river Ganges, originates from the Yamunotri glacier near Bandarpoonch peaks in the Mussoorie range of the lower Himalayas at an elevation of about 6387 meters above mean sea level in Uttarkashi district of Uttarakhand.

• Yamuna meets the Ganges at the Sangam (where Kumbh mela is held) in Prayagraj, Uttar Pradesh after flowing through Uttarakhand, Himachal Pradesh, Haryana and Delhi.
• Important Dams built on the river include; Lakhwar-Vyasi Dam (Uttarakhand) and Tajewala Barrage Dam (Haryana).
• Important Tributaries of the Yamuna river are Chambal, Sindh, Betwa and Ken.

Hence both statements are correct.