Kalnasalas Bog is a raised bog in Kārsava municipality, about 10 km eastwards from Kārsava town. It is a part of the Rītupe River basin.

Area: 612 ha.

Average depth of the peat layer: 1.3 m; deepest: 3.5 m

Total peat deposit: 6.7 mil m3.

The upper layer of peat has little decomposed; in lower layers it is medium and well decayed. The bog emerged, when a water basin overgrew. To drain the bog water in the south-western part there is a ditch. The bog is overgrown with forest and small pine-trees. 

 

Latvijas daba. 2.sēj. – Rīga: Latvijas enciklopēdija, 1995. – P. 213.