The pla­teau on the south of Bil­ling­en is a natu­re reserve.

The bed­rock throug­hout the reser­ve is dole­ri­te. The soil lay­ers are eit­her a thin morai­ne cover or more or less mas­si­ve peat lay­ers. Becau­se the dolerite’s flat upper sur­fa­ce is criss-crossed by fractu­res and hol­lows, a mosa­ic lands­cape has been cre­a­ted, with wood­land cove­ring the dry­er parts and mars­hes cove­ring the wet­ter parts.

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Syd­bil­ling­en’s pla­teau is a natu­re reser­ve.