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![View in over Mostraumen.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/mo_16.jpg?itok=GnR34JLO)
Mostraumen
Until 1743 the people from Modal had to wait for a flood in MOSTRAUMEN before they could draw their boats up the river current, and then row back across Lake Movatnet. But, that year the flood opened a free passageway all the way to Mo. Hordaland had gained a new tidal waterway.
![Under the grass fields lie large quantities of sand and gravel.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/mo_24.jpg?itok=e4ePAE19)
Nedre Helland- Sand Quarries
The three spades in the municipal coat of arms for Modalen are sand spades. Sand quarrying has brought income and employment. As much as 70,000-80,0000 tonnes of sand and gravel left the municipality each year since the turn of the millennium, to be used as cementing sand. Why is Modalen endowed with so much sand?
![Nils Hertzber’s watercolour from 1829 gives us an impression of the burial site with the menhirs at Årbakkesanden.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/1/kvh_222-1-1.jpg?itok=iSlCbTy_)
Årbakka- The prehistoric site
The prehistoric site at Årbakkasanden with menhirs and burial mounds has been visited, described and illustrated by many learned researchers through the last 350 years. All the same, we still know very little of this unique cultural monument.