Riekstu kalns atrodas Baldones pagastā, atrodas 82 m virs jūras līmeņa. Kopš 1959. gada tur darbojas darbojas Radioastrofizikas observatorija, kurā pēta oglekļa zvaigznes, kā arī fizikālos procesus saules aktīvajos apgabalos un uzliesmojumos
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