Smu­la ås is a well-deve­lo­ped esker, which is part of a lar­ger area of eskers resembling a kame landscape.

The almost kilo­met­re-long ridge stret­ches in a north–south direc­tion through the agricul­tural lands­cape of Smu­la parish. Eskers for­med during the last ice age, as mel­t­wa­ter bene­ath the ice cre­a­ted ridges of sto­nes, gra­vel, and sand. Eskers run paral­lel to the ice’s direc­tion of move­ment, usu­al­ly north–south. The sto­nes, gra­vel, and sand in the esker are roun­ded and arrang­ed by size.

Smu­la ås is par­ti­al­ly steep and rises abo­ve the sur­rounding lands­cape. To the south it bor­ders to the river Ätran. The ridge used to be mowed, but during the 20th cen­tu­ry the mowing was repla­ced by gra­zing. The flo­ra on the ridge is lime-loving and typi­cal of dry meadows.

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Smu­la ås is a natu­re reser­ve.