sand hill; dune
Refers to a hill or mound made of sand, whether natural (dune) or man-made (e.g., in a sandbox).
The children are playing on the sand hill in the park.
There were many large dunes on the coast.
Standard kanji spelling for 'sand hill' or 'dune'.
Compound of 砂 (すな, 'sand') and 山 (やま, 'mountain, hill'). The reading さやま is a rare alternate reading, likely a contraction or dialectal variant, but すなやま is the standard.