"Jestem na wybrzeżu."

Translation: I am at the coast.

[Brooks180286]

I would say, "on the coast"

[one_half_3544]

"I'm on the shore" does not get accepted, but should be, I think. Reported.

[Jellei]

Added.

[Jean-Lucfranois]

and what about seaside ?

[Jellei]

Added 'the seaside'.

[stramner]

"I'm on a coast" Why not?

[obado]

Incorrect English - shouldn't be added

[Jellei]

Okay, after consulting it again, removed.

[Jellei]

Oversight, added.

[rchonak]

"I am by the shore" is not accepted. Good enough?

[Jellei]

Good enough. Added.

[ankbhatnagar]

What's the difference between wybrzeżu and plaża?

[Jellei]

"wybrzeże" is the coast, the shoreline, where a country borders with the sea.

"plaża" (a beach) can be located on the coast, but it can also generally be next to any bigger body of water, e.g. a river. We have a "plaża" in Warsaw, quite far from the sea.

[JanKLinde]

The hint says "by the coast" – that's not totally wrong, but quite uncommon. It's usually "by the sea", but "on/at the coast" (a city is on the coast; people are at the coast).

[Jellei]

Agreeed, removed the hint. The translation says "at the coast" anyway.