The planar form of the “salt ngers” cells (a top view) was observed and investigated qualitatively in the rst experimental work of Stommel et al. [1] in 1968. It was discovered that in the salt–temperature double-di$usive system, the planar form of these cells is polygon-like (mainly rectangular or square forms) and the typical width of the “salt nger” cells is about 0.3–0:6 cm.