Vakṣu Vaṅkṣu，又作婆輸，婆叉，婆槎，薄叉，博叉。閻浮提四大河之一也。出自阿耨達池之西面，入於西北海云。西域記一曰：「池西面琉璃馬口流出縛芻河（舊曰博叉河訛也），繞池一匝入西北海。」玄應音義二十四曰：「縛芻河，舊言博叉河，或作薄叉，又亦云婆叉河，又言噱叉河，皆一也，此云青河。」
Vakṣu; Vaṅkṣu; 婆芻 (or 婆槎 or婆輸); 薄叉; 博叉; the Oxus 青河 or Blue River, one of the 'four great rivers of Jambudvīpa', rising in the west of the Anavatapta lake (Tibet) and flowing into the north-west sea, the Caspian; cf. 西城記 1.
縛芻 此云青河。西域記云：舊曰博叉，訛也。