Manusmriti
सरस्वतीदृशद्वत्योर्देवनद्योर्यदन्तरम् । तं देवनिर्मितं देशं ब्रह्मावर्तं प्रचक्षते ॥ १७ ॥
That land, created by the gods, which lies between the two divine rivers Sarasvati and Drishadvati, the (sages) call Brahmavarta.
english translation
sarasvatIdRzadvatyordevanadyoryadantaram । taM devanirmitaM dezaM brahmAvartaM pracakSate ॥ 17 ॥
hk transliteration by Sanscript