The Alakananda branch of the Ganges flows down upon the mountain Himakuta

Expressions researched:
"Alakananda branch flows through Brahmalaya, crosses over many mountains, including Hemakuta and Himakuta" |"falls down with fierce force upon the peaks of the mountains Hemakuta and Himakuta"

SB Canto 5

The Alakanandā branch of the Ganges flows through Brahmālaya, crosses over many mountains, including Hemakūṭa and Himakūṭa, and then reaches Bhārata-varṣa, where it flows into the southern side of the ocean of salt water.

SB 5.17 Summary:

The Ganges River, emanating from the lotus feet of the Lord, inundates the heavenly planets, especially the moon, and then flows through Brahmapurī atop Mount Meru. Here the river divides into four branches (known as Sītā, Alakanandā, Cakṣu and Bhadrā), which then flow down to the ocean of salt water. The branch known as Sītā flows through Śekhara-parvata and Gandhamādana-parvata and then flows down to Bhadrāśva-varṣa, where it mixes with the ocean of salt water in the West. The Cakṣu branch flows through Mālyavān-giri and, after reaching Ketumāla-varṣa, mixes with the ocean of salt water in the West. The branch known as Bhadrā flows onto Mount Meru, Mount Kumuda, and the Nīla, Śveta and Śṛṅgavān mountains before it reaches Kuru-deśa, where it flows into the ocean of salt water in the north. The Alakanandā branch flows through Brahmālaya, crosses over many mountains, including Hemakūṭa and Himakūṭa, and then reaches Bhārata-varṣa, where it flows into the southern side of the ocean of salt water. Many other rivers and their branches flow through the nine varṣas.

Passing over the tops of mountains in various lands, the Alakanandā branch of the Ganges falls down with fierce force upon the peaks of the mountains Hemakūṭa and Himakūṭa.

SB 5.17.9, Translation:

Similarly, the branch of the Ganges known as Alakanandā flows from the southern side of Brahmapurī (Brahma-sadana). Passing over the tops of mountains in various lands, it falls down with fierce force upon the peaks of the mountains Hemakūṭa and Himakūṭa. After inundating the tops of those mountains, the Ganges falls down onto the tract of land known as Bhārata-varṣa, which she also inundates. Then the Ganges flows into the ocean of salt water in the south. Persons who come to bathe in this river are fortunate. It is not very difficult for them to achieve with every step the results of performing great sacrifices like the Rājasūya and Aśvamedha yajñas.