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A good cadastral system makes the buying and selling of land, as well as the collection of taxes, easy.

Erika Reed, a director for land and cadastral survey at the Bureau of Land Management, says the federal agency is required to follow a narrower definition of navigability defined in case law.

The central question: Does the border run down the middle of the Danube, as Serbia says, or along an old cadastral route, as Croatia claims?

After conquering Switzerland, the Netherlands and Belgium, Napoleon introduced cadastral maps there, as well.

These ‘cadastral’ maps delineate property boundaries and record the ownership of small parcels of land; some of the documents are as large as 4 metres by 7 metres.