D35a

Großsteingrab Valthe-Valterspaan was a megalithic burial monument of the western Funnel Beaker culture at Valthe, now a district of Borger-Odoorn in the Dutch province of Drenthe. It stood south of Valthe in the Valtherspaan, amid several other megalithic tombs. The monument is also called Valthe-Valtherspaan and carries the van-Giffen number D35a.

The monument was probably a passage grave. Janssen described a burial chamber measuring 12 m by 2,5 m, built from five pairs of wall stones along its long sides and one end stone at each short side. When Albert Egges van Giffen excavated it in 1920, he instead found an oval pit containing a chamber measuring 7,1 m by 2 m. Evert van Ginkel considered two different tombs as one possible explanation, although a mistaken reading of the excavation was also possible.

Caspar Reuvens first described the monument in 1833. Leonhardt Johannes Friedrich Janssen visited it in 1847 and included it in an overview published in 1848 with construction descriptions and schematic plans. The tomb was destroyed in the 1870s, and van Giffen examined its remains in 1920. Its dating is estimated from its type to 3500 BCE to 2800 BCE.

Monuments of this kind in the Netherlands are known as hunebedden. They belong to the western group of the Funnel Beaker culture and were generally built between 3470 and 3250 BCE, then used until about 2760 BCE. The surviving stones at Valthe-Valterspaan are gone; only archaeological traces and the excavated remains are known.

D35a is a dolmen in Borger-Odoorn, Germany. Wikidata describes it as: former dolmen in Odoorn, Netherlands. A typological estimate: 3500 BCE to 2800 BCE. No English Wikipedia article exists for it; the full text below is the German article "Großsteingrab Valthe-Valtherspaan", shown in the original language.