According to pre-war data, Katišius is the neighboring lake (signed currently as Grikutis).
Is the current data right?

There is a mistake in Wikipedia, as "Laumiakėlis" is another lake, a couple of hundred meters Southwards.

There is a series of vandalized homes over here... Please backup these ones

"ola" or "uola"? Which is the correct orthography in Lithuanian? Even here I found both .........

Please verify the exact path of the Vara river

Somewhere near should be drawn:
dabas liegums „ Ozolkalni”
https://www.daba.gov.lv/public/lat/iadt/dabas_parki/daugavas_ieleja/#Ozolkalni

Hi. I know, by principle, the "A" roads in Lithuania should be signed as "trunk" and the "regional" ones as "primary. Nevertheless, perhaps we should make an exception here along Joniškis, with A12 and Joniškis bypass (210). Several OSM-based GPS-es suggest to drive from Šiauliai to Riga via Joniškis instead of this bypass... If you look at Vilnius, such exceptions are made on a regular bases (Oslo g., Western bypass, Maironio g., etc.). How do you think?

I have a serious doubt regarding the name of the river in Lithuanian over here. Seems that Belarusians (and Poles before WW2) consider one part of the Verseka as a different river different from the other, but Lithuanians don't. Moreover, I found an existing relation with "Vereska (Gornostajus)" in the name:lt tag... What would you suggest?

Where do those trails (LV: taka) start and end exactly?

Draw all roads around