Megalithic mound (tumulus with integral stones)
Bonäsbåset
DatedEst. 2000–500 BCE
No licensed photograph yetWe have no photograph we may publish for this site, so the interpretive 3D view leads instead.
Overview
About this site
Overview
Bonäsbåset is a lake at Tenhola, in the central part of Raasepori in south-western Uusimaa, Finland. It has an area of 57 hectares and lies 11 kilometres north-north-west of Tammisaari (Ekenäs).
Read on Wikipedia2 min readCC BY-SA 4.0
Where it sits in time
The site's dated range, placed against world reference points.
The scale is logarithmic: each step to the left is about ten times older than the last.
Article
Bonäsbåset
The shoreline of the western basin is winding, whereas the eastern part is fairly uniform in width with a rather straight shore.
SettingSources for this section
- Wikipedia (Finnish): BonäsbåsetCC BY-SA 4.0
Sources for this section
- Wikipedia (Finnish): BonäsbåsetCC BY-SA 4.0
The lake is about one and a half kilometres long from west to east. The shoreline of the western basin is winding, whereas the eastern part is fairly uniform in width with a rather straight shore. There are no islands. Bonäsholmen, in the western part, is a peninsula, and a small nature reserve lies within it. The shores of the eastern part are wooded.
The deepest point, 11.7 metres, lies in the eastern part of the lake; the western part also has a basin of almost ten metres. The surroundings of Bonäsbåset are an old cultural landscape with several ancient graves.
DescriptionSources for this section
- Wikipedia (Finnish): BonäsbåsetCC BY-SA 4.0
Sources for this section
- Wikipedia (Finnish): BonäsbåsetCC BY-SA 4.0
An outflow ditch runs into Bonäsbåset from Ovanmalmträsket to the north-west, and another leaves it to the south-west towards Gennarbyviken. Less than a kilometre east of the lake lie Långträsket and Sidsbackaträsket. The water volume is 2,596,000 cubic metres. The ecological status of the lake is satisfactory and its chemical status is good.
Bonäsbåset (82.010.1.001) belongs to the Bonäsån drainage basin (82.01), which is part of the main catchment area of the Archipelago Sea coastal region and Åland (82).
Tradition and region
About this kind of monument
Finnish Bronze Age cairns and giant's churches
Finland's prehistoric stone monuments are cairns and boulder enclosures, built by hunter-gatherers and early farmers on ridges that once looked out over the sea. The best-preserved cairn field is Sammallahdenmäki, near Rauma, a UNESCO World Heritage Site since 1999. Thirty-three granite cairns lie in clusters along a long ridge, built from boulders quarried from the cliff below or gathered on the spot. They date from about 1500 to 500 BCE; twenty-eight are early Bronze Age and the rest early Iron Age. Two are unusual: the Huilun pitkä raunio, the "long ruin of Huilu", is ringed by an ancient stone wall, and Kirkonlaattia, "Church Floor", is a rectangular cairn. Many cairns have not been dug, and dating then relies on their shape and on excavated neighbours.
An older and different tradition is the "Giant's Churches" (Jätinkirkko) of the Ostrobothnia coast. These are rectangular or oval embankments of boulders, about forty known, spread along a 400-kilometre strip of coast from Kokkola to Kemi. They are dated to the Subneolithic, roughly 3500 to 2000 BCE, and were built by hunter-gatherers; the largest known, Kastelli, encloses an area of 60 by 35 metres. Although they stand inland today, they were probably built on the shore. There is no firm evidence of their purpose; one suggestion is that seal hunters used them on the spring ice.
The name is itself folk tradition: jätinkirkko, "giant's church", is a popular label that says nothing about what the enclosures were really for.
When visiting, walk a cairn field along the ridge and notice how each cairn sits slightly apart, often on the highest ground, and look for the straight sides and rounded corners of a giant's church in the forest.
Paraphrased from Wikipedia: Sammallahdenmäki, Wikipedia: Giant's Churches, Wikipedia: Cairn, Wikipedia: Burial mound · CC BY-SA 4.0
From the article
Dated moments in the story
- 596 CE
Vesitilavuus on 2 596 000 kuutiometriä.
Source
See it in 3D
An interpretive reconstruction of the monument, standing on the real ground at its exact point, under the sun for that place and season. Drag to look around it.
The reconstruction is ours, not a survey: it shows what a monument of this type looks like, at the size the record gives for this one.
Lore
Evidence & Lore
What the sources actually support — and, kept apart, what has been claimed.
What the evidence supports
Dates
Est. 2000–500 BCEHow this date was established: Type comparisonTypical range for megalithic mounds in Finland; this site has not been dated itself. Finnish burial mounds belong to the Bronze Age of the Nordic sphere (c. 2000-500 BC); the Battle Axe culture flourished in south-west Finland c. 2800-2300 BC.Source for this date
Where it stands
Finland
The pin marks the monument itself — its exact point.
- Coordinates
- 60°04′32″ N, 23°22′40″ EFor a GPS or map app: 60.07552, 23.37765
Access is as our sources describe it; we have not visited the site to check.
Nearby
The closest sites in the Atlas, by straight line.
- Megalithic mound (tumulus with integral stones)Kulla2000–500 BCE
- Megalithic mound (tumulus with integral stones)Hjälmäng 12000–500 BCE
- Megalithic mound (tumulus with integral stones)Hjälmäng 22000–500 BCE
- Megalithic mound (tumulus with integral stones)Hjälmäng 32000–500 BCE
- Megalithic mound (tumulus with integral stones)Brännberget2000–500 BCE
- Megalithic mound (tumulus with integral stones)Degerbacka2000–500 BCE
- Megalithic mound (tumulus with integral stones)Kasberget2000–500 BCE
- Megalithic mound (tumulus with integral stones)Fastarby 12000–500 BCE
Sources
Every record behind this page, with the link it came from.
2 sources behind this page
- 01Wikidata Q29365680wikidata.org
- 02Source for this dateen.wikipedia.org
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Around this place
The ten nearest sites, by compass
Credit
Text, licence and sources
Adapted from the Wikipedia article "Bonäsbåset" (Finnish), licensed CC BY-SA 4.0; authors are listed in the page history. Reused under CC BY-SA 4.0. Read on Wikipedia · Edit history and authors
- Wikipedia (Finnish): BonäsbåsetCC BY-SA 4.0
- Wikidata Q29365680CC0