Word for naturally occurring land formations, that starts with S?

Is there a word for naturally occurring land formations that starts with S?

how many letters?

Strait?

It’s just something my dad asked me.
He believes the term exists and says that it has been bugging him for years.

It’s more a term for that actual formations of things naturally.

Steppes?

Scarp
Scabland

Speleothem?

Syncline?
It would help if you were able to recall what sort of landform was being described.

Without much more to go on, try looking through this glossary of geological terms beginning with S.

Sandbank?

Strata (or stratification)?
Sedimentation?

Shoals?

sandbar

Shitpile?

I thought of steppes.

Seashore? Sandstone? Sierra?

serac
solfatera
strata
swale

I thought of strata as well.

Shifting Saharan Sand-dunes?

Swale
Stalagtites
Stalagmites

sierra
Sahara
seashore
slope
swamp
shoal
sandbar
savanna
scarp