Daniel 10:4

New English Translation

⁴On the twenty-fourth day of the first month^[a] I was beside the great river, the Tigris.^[b]

Daniel 10:4 sn The first month would be the month of Nisan, during which Passover was observed.
Daniel 10:4 tn The Hebrew text has חִדָּקֶל (hiddaqel). “Tigris” appears here in the LXX, since it is the Greek name for this river. Elsewhere in the OT “the great river” refers to the Euphrates (e.g., Gen 15:18; Josh 1:4), leading some interpreters to think that a mistake is involved in using the expression to refer to the Tigris. But it is doubtful that the expression had such a fixed and limited usage. The Syriac, however, does render the word here by “Euphrates” (Syr. perat) in keeping with biblical usage elsewhere.

New English Translation (NET)