What's in a Prague street name

Originally published on Twitter on 24 May 2022.

V Jezerách was built in 1925.

I was going to say that this means ‘In the lakes’ and move on, but that would be v jezerech with a second e and not an á.

One lake is a jezero, two lakes are jezera, and a small lake or pond or lakelet (or ‘tarn’, apparently) would be a jezírko.

But a jezera (singular, and presumably feminine, whereas jezero is neuter) is something I can’t find a reference to. So either this does mean ‘in the lakes’, or jezera (singular) is an archaic term.

In any case, it appears that the land was wet round here at some point.