Learn Dutch: Ik zie de barrière en ik loop eromheen. - I see the barrier and I walk around it.

It combines er (it) with the split preposition (or circumposition) om ... heen. If you mentioned the barrier directly in that clause, you would say om de barrière heen. When you replace the noun with er, all the prepositional parts merge into one word: eromheen.

Why use eromheen instead of just erom?

While erom can mean "around it" in a static sense (like a ribbon tied around a box), adding heen strongly emphasizes a physical trajectory or movement past an obstacle. Because you are physically walking around a barrier, eromheen is the most natural and descriptive choice.

Can eromheen be split up in this sentence?

Yes! It is written as one word here because there is no other information between the verb and the end of the sentence. However, if you add other words, it typically splits. For example, "I walk quickly around it" would be ik loop er snel omheen. The er stays early in the clause, while omheen gets pushed to the very end.