noun, masculine/e.tɑ̃/plural: étangs
étang is masculine in French.
pond (small lake, often shallow); lagoon (especially on the Mediterranean coast)
“Étang de Thau” — Thau Lagoon
Derived from the Old French verb estanchier, through an earlier form estanc. Unrelated to Latin stāgnum (“pond”), which influenced the change in spelling from ⟨c⟩ to ⟨g⟩.