What separates the continents of north america and south america

The border between North America and South America is at some point on theIsthmus of Panama. The most common demarcation in atlases and other sources follows the Darién Mountains watershed divide along the Colombia-Panama border where the isthmus meets the South American continent.

If you mean physically? The definition of a continent is a large, continuous, discrete mass of land, ideally separated by an expanse of water. so the Caribbean Sea, or the Panama Canal

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australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.