Charles Ellicott Commentary Psalms 78:12

"Marvellous things did he in the sight of their fathers, In the land of Egypt, in the field of Zoan." — Psalms 78:12 (ASV)

Field of Zoan. —See Numbers 13:22. It is the classical “Tanis,” merely a corruption of Tsoan, i.e., low country (Septuagint and Vulgate). Tanis is situated on the east bank of what was formerly called the Tanitic branch of the Nile. Between it and Pelusium, about thirty miles to the east, stretched a rich plain known as “the marshes,” or “the pastures,” or “the field” of Zoan.

The psalm now turns to the adventures in the wilderness, postponing the marvels in Egypt till Psalms 78:43.